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I have a problem with the performance of the application in case of huge volumes of data. I have two tables. Each of them has 30+lakhs of records. I have to extract data from one table and store these records in a temporary table. next I have to extract data from the second table and update the temporary table for each and every record. For this purpose I have to write a update command in a loop of roughly 3 lakh records. Means the loop executes 3 lakh times. As a result of this the performace is getting effected very badly. can some one let me know the points to be taken care when working with huge volumes of data.
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Uma Kameswari wrote: can some one let me know the points to be taken care when working with huge volumes of data
Your question isn't very specific so some general notes:
- correct design flaws
- use efficient indexing
- use features in SQL language
- try to get rid of middle steps
- optimize the database
- optimize the hardware
Uma Kameswari wrote: Each of them has 30+lakhs of records
I don't know what 30+lakhs means. It could be millions of rows, but if it's only for example 30000 that's not much.
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Mika Wendelius wrote: I don't know what 30+lakhs means.
30+lakhs is more than 3 million; that is a lot of rows...
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Luc Pattyn wrote: 30+lakhs is more than 3 million
Thanks, good to know
Luc Pattyn wrote: that is a lot of rows...
It depends. If the logic OP described is executed continuously, then it's a lot, but then again I would say it's a design problem in that case.
If the operation is executed for example once a day and the desired throughput time is, let's say less than 1 minute, it should be doable (of course depending on the overall logic).
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Thanks for the suggestion. I am working with accounting tables.
subledger and general ledger. I developed an application that should show me the difference between subledger and general ledger. the design is as follows
1. retrieve the data from the subledger table into a dataset and copy this dataset into a new table.
2. retrieve data from the general ledger table into a dataset and run a loop .
3. within the loop update the rows of new table created in step 1 and if no row is updated then add a new row.
4. a stored procedure that uses cursor on the new table to set the status based on comparison of data from 3 fields of the new table.
The time taken for performing the above steps is 1 hour when 28556 records are fetched.
Hope this is clear. When all the 3 million records are retrieved it took roughly 3 days.
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Uma Kameswari wrote: a stored procedure that uses cursor
There's your biggest design problem that I can see. I have no idea what updates you need to make, but if performance is an issue, try to eliminate the need for opening a CURSOR. They are VERY expensive to use and their performance sucks.
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can u suggest me an alternative
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Like I said, I know nothing of the updates you're trying to do, so no, I can't make any suggestions.
The lake of detail in your question and the absense of any code snippets makes it pretty much impossible to give you any alternatives, if at all possible.
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Here is the code snippet
in the application this is my first step
"select rm1.docnumbr DOCNUMBR,rm1.custnmbr CUSTNMBR,rm1.trxsorce TRXSORCE,rm2.docdate DOCDATE,rm2.postdate POSTDATE,rm2.glpostdt GLPOSTDT,PSTUSRID,ORTRXAMT,rm2.DEX_ROW_ID H_DEX_ROW_ID,rm1.DEX_ROW_ID D_DEX_ROW_ID, rm1.dstindx,rm1.debitamt,rm1.crdtamnt,(select rtrim(actnumbr_1) + '-'+rtrim(actnumbr_2) + '-'+rtrim(actnumbr_3) + '-' + rtrim(actnumbr_4) + '-' + rtrim(actnumbr_5) + '-' + rtrim(actnumbr_6) + '-' + rtrim(actnumbr_7) from gl00100 where actindx = rm1.dstindx) 'Account',seqnumbr from rm10101 rm1,rm20101 rm2 where rm2.docdate between convert(datetime,'" + dtFrom.ToShortDateString() + "',103) and convert(datetime,'" + dtTo.ToShortDateString() + "',103 and rm1.docnumbr = rm2.docnumbr and rm1.custnmbr = rm2.custnmbr and rm1.rmdtypal = rm2.rmdtypal and rm1.dstindx in(" + strAcc + ")"
In the above query strAcc,dtFrom,dtTo are user inputs.
the results of the above query are taken into a dataset.
a loop for the above resultset storing the data into a new dataset which is used in bulk copy into a new table as follows.
DataTable DT = new DataTable();
DT = ds.Tables["SRC"];
#region bulkcopy
string strDB = conn.Database.ToString();
SqlBulkCopy bk = new SqlBulkCopy(conn);
bk.DestinationTableName = strDB + ".dbo.gl_sl_cmpr";
bk.WriteToServer(DT);
This code is getting executed with no issue.
Now I have to get records from general ledger and and update the above table gl_sl_cmpr if no updation is done then I have to insert a new row. For this I am writing the below code
SELECT JRNENTRY,trxdate,trxsorce,USWHPSTD,ortrxsrc,orgntsrc,orctrnum,debitamt,crdtamnt,Dex_row_id,actindx,(select rtrim(actnumbr_1) + '-'+rtrim(actnumbr_2) + '-'+rtrim(actnumbr_3) + '-' + rtrim(actnumbr_4) + '-' + rtrim(actnumbr_5) + '-' + rtrim(actnumbr_6) + '-' + rtrim(actnumbr_7) from gl00100 g1 where g1.actindx = g.actindx) 'account', origseqnum FROM GL20000 g WHERE trxdate between convert(datetime,'" + dtMinGLPostDt.ToShortDateString() + "',103) and convert(datetime,'" + dtMaxGLPostDt.ToShortDateString() + "',103) and actindx in (" + strAcc + ") and series <> 2 and correspondingunit <> 1
the result of this query is taken into a dataset and following loop is executed.
for (int i = 0; i < ds.Tables["InGL"].Rows.Count; i++)
{
iJrnEntry = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["JRNENTRY"]);
dtTrxDate = Convert.ToDateTime(ds.Tables["InGL"].Rows[i]["trxdate"]);
strTrxSorce = ds.Tables["InGL"].Rows[i]["trxsorce"].ToString();
strActIndex = ds.Tables["InGL"].Rows[i]["account"].ToString();
strGLUser = ds.Tables["InGL"].Rows[i]["USWHPSTD"].ToString();
strOrgnTrxSorce = ds.Tables["InGL"].Rows[i]["orgntsrc"].ToString();
strOrgnDocNo = ds.Tables["InGL"].Rows[i]["orctrnum"].ToString();
strOrTrxSrc = ds.Tables["InGL"].Rows[i]["ortrxsrc"].ToString();
dclGLDr = Convert.ToDecimal(ds.Tables["InGL"].Rows[i]["debitamt"]);
dclGLCr = Convert.ToDecimal(ds.Tables["InGL"].Rows[i]["crdtamnt"]);
dexrowid = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["Dex_row_id"]);
iGLACT = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["actindx"]);
iGlSeqNo = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["origseqnum"]);
strOrgnDocNo = strOrgnDocNo.Replace("'", "''");
strSource = strOrgnTrxSorce.Trim();
if (strOrgnTrxSorce.Trim() == "")
strSource = strOrTrxSrc;
if(iGlSeqNo !=0)
cmd.CommandText = "update gl_sl_cmpr set JRNENTRY= " + iJrnEntry + ",GLTRXDATE=COnvert(datetime,'" + dtTrxDate.ToShortDateString() + "',103),SOURCE='" + strTrxSorce + "',GLACTINDEX='" + strActIndex + "',USWHPSTD='" + strGLUser + "',ORTRXSRC='" + strOrgnTrxSorce + "',ORGCTRNUM='" + strOrgnDocNo + "',GLDR=" + dclGLDr + ",GLCR =" + dclGLCr + ",gldexrowid=" + dexrowid + " ,glact = " + iGLACT + ", status = 1 where sopno='" + strOrgnDocNo + "' and actindex ='" + strActIndex + "' and trxsorce='" + strSource + "' and seqnumbr=" + iGlSeqNo;
else
cmd.CommandText = "update gl_sl_cmpr set JRNENTRY= " + iJrnEntry + ",GLTRXDATE=COnvert(datetime,'" + dtTrxDate.ToShortDateString() + "',103),SOURCE='" + strTrxSorce + "',GLACTINDEX='" + strActIndex + "',USWHPSTD='" + strGLUser + "',ORTRXSRC='" + strOrgnTrxSorce + "',ORGCTRNUM='" + strOrgnDocNo + "',GLDR=" + dclGLDr + ",GLCR =" + dclGLCr + ",gldexrowid=" + dexrowid + " ,glact = " + iGLACT + ", status = 1 where sopno='" + strOrgnDocNo + "' and actindex ='" + strActIndex + "' and trxsorce='" + strSource + "'";
int cnt = cmd.ExecuteNonQuery();
if (cnt == 0)
{
cmd.CommandText = " insert into gl_sl_cmpr(jrnentry,gltrxdate,SOURCE,GLACTINDEX,USWHPSTD,ORTRXSRC,ORGCTRNUM,GLDR,GLCR,gldexrowid,glact,status) values (" + iJrnEntry + ",COnvert(datetime,'" + dtTrxDate.ToShortDateString() + "',103),'" + strTrxSorce + "','" + strActIndex + "','" + strGLUser + "','" + strOrgnTrxSorce + "','" + strOrgnDocNo + "'," + dclGLDr + "," + dclGLCr + "," + dexrowid + "," + iGLACT + ",2)";
cmd.ExecuteNonQuery();
}
iCount++;
}
After this the below stored procedure is called to set the status
the stored procedure is as below
CREATE PROCEDURE [dbo].[spSetStatus] --@strAcc nvarchar(1000)
AS
BEGIN
declare @SopNo nvarchar(31)
declare @SLAct int
Declare @trxsorce nvarchar(31)
declare @OnAccount decimal
declare @SLDr decimal
declare @SLCr decimal
declare @GLDr decimal
declare @GLCr decimal
declare @jrnEntry int
declare @SLDrSum decimal
declare @SLCrSum decimal
declare @GLDrSum decimal
declare @GLCrSum decimal
declare @Status int
declare cur_status_update cursor for select sopno,act,trxsorce,onaccount,SLDr,SLCr,GLDr,GLCr,jrnentry from gl_sl_cmpr where status not in (2,4)
open cur_status_update
fetch next from cur_status_update into
@SopNo,@SLAct,@trxsorce,@OnAccount,@SLDr,@SLCr,@GLDr,@GLCr,@jrnentry
while @@fetch_status = 0
begin
Set @Status = 1
select @SLDrSum = sum(SLDr),@SLCrSum = sum(SLCr), @GLDrSum = sum(GLDr), @GLCrSum = sum(GLCr) from gl_sl_cmpr where sopno=@SopNo --and convert(nvarchar,act) in (@strAcc)
if (@Onaccount = @SLDrSum or @Onaccount = @SLCrSum )
Set @Status = 1
else
Set @Status = 5
if (@SLDrSum = @GLDrSum and @SLCrSum = @GLCrSum )
Set @Status = 1
else
Set @Status = 6
update gl_sl_cmpr set status = @Status where sopno = @SopNo and act = @SLAct and trxsorce = @trxsorce
fetch next from cur_status_update into
@SopNo,@SLAct,@trxsorce,@OnAccount,@SLDr,@SLCr,@GLDr,@GLCr,@jrnentry
end
close cur_status_update
deallocate cur_status_update
END
Can u suggest the changes to improve the performance.
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If I interpreted the logic correctly, something like following statements should do the same updates as your procedure:
update gl_sl_cmpr
set status = 1
WHERE status not in (2,4)
AND ( OnAccount = (SELECT sum(SLDr) FROM from gl_sl_cmpr sub1 where sub1.sopno = gl_sl_cmpr.sopno)
OR OnAccount = (SELECT sum(SLCr) FROM from gl_sl_cmpr sub1 where sub1.sopno = gl_sl_cmpr.sopno))
OR ( (SELECT sum(SLDr) FROM gl_sl_cmpr sub1 where sub1.sopno = gl_sl_cmpr.sopno)
= (SELECT sum(GLDr) FROM gl_sl_cmpr sub2 where sub2.sopno = gl_sl_cmpr.sopno)
AND (SELECT sum(SLCr) FROM gl_sl_cmpr sub3 where sub3.sopno = gl_sl_cmpr.sopno)
= (SELECT sum(GLCr) FROM gl_sl_cmpr sub4 where sub4.sopno = gl_sl_cmpr.sopno)))
--
update gl_sl_cmpr
set status = 6
WHERE status not in (2,4)
AND ( OnAccount != (SELECT sum(SLDr) FROM from gl_sl_cmpr sub1 where sub1.sopno = gl_sl_cmpr.sopno)
AND OnAccount != (SELECT sum(SLCr) FROM from gl_sl_cmpr sub1 where sub1.sopno = gl_sl_cmpr.sopno))
AND ( (SELECT sum(SLDr) FROM gl_sl_cmpr sub1 where sub1.sopno = gl_sl_cmpr.sopno)
!= (SELECT sum(GLDr) FROM gl_sl_cmpr sub2 where sub2.sopno = gl_sl_cmpr.sopno)
OR (SELECT sum(SLCr) FROM gl_sl_cmpr sub3 where sub3.sopno = gl_sl_cmpr.sopno)
!= (SELECT sum(GLCr) FROM gl_sl_cmpr sub4 where sub4.sopno = gl_sl_cmpr.sopno)))
That should speed up a lot.
Then, you partially have the logic at client side and partially in the database.
Try to use the database (do all the updates at server side)
Also I think you have design issues if this logic is needed often since it's for example
relying on summed fields and seems that it has redundancy etc.
Redesign on these areas should have a major impact on performance
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Thank you for the suggestion and uopdate query. Need to work it out and check.The query seems to be similar to what I am looking for.
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The alternate update statements given by you helped me a lot in speeding up the process. I have few more areas where I need to re-design the logic. I am giving the code below. Please suggest alternative for this. roughly the loop is going to run for 100,000 to 300,000 rows.
for (int i = 0; i < ds.Tables["InGL"].Rows.Count; i++)
{
iJrnEntry = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["JRNENTRY"]);
dtTrxDate = Convert.ToDateTime(ds.Tables["InGL"].Rows[i]["trxdate"]);
strTrxSorce = ds.Tables["InGL"].Rows[i]["trxsorce"].ToString();
strActIndex = ds.Tables["InGL"].Rows[i]["account"].ToString();
strGLUser = ds.Tables["InGL"].Rows[i]["USWHPSTD"].ToString();
strOrgnTrxSorce = ds.Tables["InGL"].Rows[i]["orgntsrc"].ToString();
strOrgnDocNo = ds.Tables["InGL"].Rows[i]["orctrnum"].ToString();
strOrTrxSrc = ds.Tables["InGL"].Rows[i]["ortrxsrc"].ToString();
dclGLDr = Convert.ToDecimal(ds.Tables["InGL"].Rows[i]["debitamt"]);
dclGLCr = Convert.ToDecimal(ds.Tables["InGL"].Rows[i]["crdtamnt"]);
dexrowid = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["Dex_row_id"]);
iGLACT = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["actindx"]);
iGlSeqNo = Convert.ToInt32(ds.Tables["InGL"].Rows[i]["origseqnum"]);
strOrgnDocNo = strOrgnDocNo.Replace("'", "''");
strSource = strOrgnTrxSorce.Trim();
if (strOrgnTrxSorce.Trim() == "")
strSource = strOrTrxSrc;
cmd.CommandText = "select count(*) from gl_sl_cmpr where sopno='" + strOrgnDocNo + "' and actindex ='" + strActIndex + "' and trxsorce='" + strSource + "'";
cmd.ExecuteNonQuery();
if (ds.Tables.Contains("matchcount"))
ds.Tables.Remove("matchcount");
da.Fill(ds, "matchcount");
reccnt = Convert.ToInt32(ds.Tables["matchcount"].Rows[0][0]);
if (reccnt == 0)
{
cmd.CommandText = " insert into gl_sl_cmpr(jrnentry,gltrxdate,SOURCE,GLACTINDEX,USWHPSTD,ORTRXSRC,ORGCTRNUM,GLDR,GLCR,gldexrowid,glact,status) values (" + iJrnEntry + ",COnvert(datetime,'" + dtTrxDate.ToShortDateString() + "',103),'" + strTrxSorce + "','" + strActIndex + "','" + strGLUser + "','" + strOrgnTrxSorce + "','" + strOrgnDocNo + "'," + dclGLDr + "," + dclGLCr + "," + dexrowid + "," + iGLACT + ",2)";
cmd.ExecuteNonQuery();
}
else if (reccnt == 1)
{
cmd.CommandText = "update gl_sl_cmpr set JRNENTRY= " + iJrnEntry + ",GLTRXDATE=COnvert(datetime,'" + dtTrxDate.ToShortDateString() + "',103),SOURCE='" + strTrxSorce + "',GLACTINDEX='" + strActIndex + "',USWHPSTD='" + strGLUser + "',ORTRXSRC='" + strOrgnTrxSorce + "',ORGCTRNUM='" + strOrgnDocNo + "',GLDR=" + dclGLDr + ",GLCR =" + dclGLCr + ",gldexrowid=" + dexrowid + " ,glact = " + iGLACT + ", status = 1 where sopno='" + strOrgnDocNo + "' and actindex ='" + strActIndex + "' and trxsorce='" + strSource + "'";
cmd.ExecuteNonQuery();
}
else
{
cmd.CommandText = "insert into gl_sl_cmpr(jrnentry,gltrxdate,SOURCE,GLACTINDEX,USWHPSTD,ORTRXSRC,ORGCTRNUM,GLDR,GLCR,gldexrowid,glact,status) values (" + iJrnEntry + ",COnvert(datetime,'" + dtTrxDate.ToShortDateString() + "',103),'" + strTrxSorce + "','" + strActIndex + "','" + strGLUser + "','" + strOrgnTrxSorce + "','" + strOrgnDocNo + "'," + dclGLDr + "," + dclGLCr + "," + dexrowid + "," + iGLACT + ",7)";
cmd.CommandText += " update gl_sl_cmpr set status = 7 where sopno='" + strOrgnDocNo + "' and actindex ='" + strActIndex + "' and trxsorce='" + strSource + "'";
cmd.ExecuteNonQuery();
}
iCount++;
}
This logic is taking very long time and I have to modify it. Please let me know if anything can be done to improve.
THanks in advance.
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Since this is a big loop, I think you have two options which both can be used:
- Move the logic to the server side. If necessary create the loop inside a stored procedure
- Try to eliminate the loops. Use the same technique as I showed you with the previous post. Try to use the logic of a SQL statement
You will gain boost to your program when you start writing operations using sets. SQL is a set based language and most efficient in it.
Currently you're creating logic with a record based approach. That's never going to be as efficient as pure SQL.
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I tried moving the entire logic to server side but still did not find any improvement. The problem is with the huge data being handled in a loop. I need a way to eliminate the loop. If I have to redo the loop with a select statement as we did in the previous case I am having some problem. I am taking the value of 2 fields based on the field value. I am giving the code below. Let me know if this can be handled in a select query directly.I think we can use switch case in the select statement but I am not sure.
SELECT JRNENTRY,trxdate,trxsorce,USWHPSTD,ortrxsrc,orgntsrc,orctrnum,debitamt,
crdtamnt,Dex_row_id,actindx,
(select rtrim(actnumbr_1) + '-'+rtrim(actnumbr_2) + '-'+
rtrim(actnumbr_3) + '-' + rtrim(actnumbr_4) + '-' +
rtrim(actnumbr_5) + '-' +
rtrim(actnumbr_6) + '-' + rtrim(actnumbr_7) from gl00100 g1
where g1.actindx = g.actindx) 'account',
origseqnum FROM GL20000 g WHERE trxdate between convert(datetime,'01/04/2007',103) and
convert(datetime,'31/03/2008',103) and
actindx in (4818,25,3189) and series <> 2
and correspondingunit <> 1
the above query gets me a record set.
in the loop for the above record set i am taking value of few fields for insertion or updation based on the value of the field. the logic is as below
for (int i = 0; i < ds.Tables["InGL"].Rows.Count; i++)
{
strOrgnTrxSorce = ds.Tables["InGL"].Rows[i]["orgntsrc"].ToString();
strOrgnDocNo = ds.Tables["InGL"].Rows[i]["orctrnum"].ToString();
strOrTrxSrc = ds.Tables["InGL"].Rows[i]["ortrxsrc"].ToString();
strSource = strOrgnTrxSorce.Trim();
if (strOrgnTrxSorce.Trim() == "")
strSource = strOrTrxSrc;
select count(*) from gl_sl_cmpr where sopno='" + strOrgnDocNo + "'
and actindex ='" + strActIndex + "' and trxsorce='" + strSource + "'"
}
based on the "select count(*) ... " query count I will either insert or update a table.
Now my problem is do I have any way of including the above logic in a single sql statement.
Also you suggested me to use loops if necessary with in stored procedure. I tried using cursor in stored procedure by moving the logic from .net but still it is taking the same time.
modified on Tuesday, December 23, 2008 12:48 AM
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select
case (select count(*) from test a
where a.trxsorce = case rtrim(b.orgntsrc)
when '' then
b.ortrxsrc
else b.orgntsrc
end
and a.act=b.actindx and a.sopno = b.orctrnum)
when 0 then
insert into test
(gltrxdate,jrnentry,source,glact,glactindex,uswhpstd,ortrxsrc,
orgctrnum,gldr,glcr,gldexrowid,status)
select trxdate,jrnentry,trxsorce,account,actindx,uswhpstd,orgntsrc,
orctrnum,debitamt,crdtamnt,dex_row_id,2
from gl20000 where dex_row_id=b.dex_row_id
when 1 then
update test set
gltrxdate = b.trxdate,jrnentry = b.jrnentry,
source = b.trxsorce,glact = b.account,
glactindex = b.actindx,uswhpstd = b.uswhpstd,
ortrxsrc = b.orgntsrc,orgctrnum = b.orctrnum,
gldr = b.debitamt,
glcr = b.crdtamnt,gldexrowid = b.dex_row_id,status =7
where sopno = b.orctrnum and actindx = b.actindx and
trxsorce = b.trxsorce
else
insert into test
(gltrxdate,jrnentry,source,glact,glactindex,uswhpstd,ortrxsrc,
orgctrnum,gldr,glcr,gldexrowid,status)
select trxdate,jrnentry,trxsorce,account,actindx,uswhpstd,orgntsrc,
orctrnum,debitamt,crdtamnt,dex_row_id,7
from gl20000 where dex_row_id=b.dex_row_id
end
from gl20000 b where
trxdate between convert(datetime,'01/04/2007',103) and
convert(datetime,'30/04/2007',103) and actindx in
(select actindx from gl00100 where actnumbr_6=1300) and
series <> 2 and correspondingunit <> 1
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Quickly looking you just have to split this to two separate statements: One update and one insert.
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How to split them. The insert or Update statement is not allowed in case statement.
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Uma Kameswari wrote: How to split them. The insert or Update statement is not allowed in case statement
Don't use single statement. Create a different insert statement and different update statement and execute both separately. Instead of using case in select, use where conditions, like:
insert into table (columns)
select columns
from anothertable
where ConditionsToBeMet and
update table
set columns
where ConditionsToBeMet Just make the conditions so that they define the logic you defined in case statement.
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Will it be feasible to create and add in for visual studio which can draw with a sketch on the coding window.
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Hello
I have this small but confusing exercise and what i want to do is when form loads it displays all the widgets in one listbox(small and big) and in second one I just want to display small widgets so could you please help me with this
code is as bellow
Imports System.Collections.Generic
Imports System.Text
Imports System.Collections
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim colBoxesOfWidgets As New ArrayList()
colBoxesOfWidgets.Add(New BoxOfWidgets("Cardboard"))
DirectCast(colBoxesOfWidgets(0), BoxOfWidgets).colWidgets.Add(New Widget("The Blue Widget", 12))
DirectCast(colBoxesOfWidgets(0), BoxOfWidgets).colWidgets.Add(New Widget("The Red Widget", 15))
DirectCast(colBoxesOfWidgets(0), BoxOfWidgets).colWidgets.Add(New Widget("The Silver Widget", 6))
DirectCast(colBoxesOfWidgets(0), BoxOfWidgets).colWidgets.Add(New Widget("The Green Widget", 52))
colBoxesOfWidgets.Add(New BoxOfWidgets("Metal"))
DirectCast(colBoxesOfWidgets(1), BoxOfWidgets).colWidgets.Add(New Widget("The Gold Widget", 9))
DirectCast(colBoxesOfWidgets(1), BoxOfWidgets).colWidgets.Add(New Widget("The Orange Widget", 115))
DirectCast(colBoxesOfWidgets(1), BoxOfWidgets).colWidgets.Add(New Widget("The Pink Widget", 1))
colBoxesOfWidgets.Add(New BoxOfWidgets("Metel"))
DirectCast(colBoxesOfWidgets(2), BoxOfWidgets).colWidgets.Add(New Widget("The Grey Widget", 12))
DirectCast(colBoxesOfWidgets(2), BoxOfWidgets).colWidgets.Add(New Widget("The Black Widget", 15))
DirectCast(colBoxesOfWidgets(2), BoxOfWidgets).colWidgets.Add(New Widget("The White Widget", 19))
DirectCast(colBoxesOfWidgets(2), BoxOfWidgets).colWidgets.Add(New Widget("The Brown Widget", 60))
DirectCast(colBoxesOfWidgets(2), BoxOfWidgets).colWidgets.Add(New Widget("The Peach Widget", 16))
Call GetRidOfTheSmallWidgets(colBoxesOfWidgets)
End Sub
Public Function GetRidOfTheSmallWidgets(ByVal colBoxesOfWidgets As ArrayList) As ArrayList
For J As Integer = 0 To colBoxesOfWidgets.Count - 1
ListBox1.Items.Add(DirectCast(colBoxesOfWidgets(J), _
BoxOfWidgets).colWidgets.Add(J))
Next :confused:
Return (colBoxesOfWidgets)
End Function
End Class
Class BoxOfWidgets
Public boxType As String
Public colWidgets As ArrayList
Public Sub New(ByVal newBoxType As String)
boxType = newBoxType
colWidgets = New ArrayList()
End Sub
End Class
Class Widget
Public name As String
Public length As Single
Public Sub New(ByVal newName As String, ByVal newLength As Single)
Me.name = newName
Me.length = newLength
End Sub
End Class
and problem with this is it loads the items in to listbox but only numbers I mean how many widgets are there in each boxof widgets but i want to display all the widgets from all boxes
waiting for your kind help
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Hi,
I have a ComboBox Column in DataGridView and also I use Cell Formatting event to change the Images dynamically in the DataGridViewImage Column based on business validations.
I am not able to retain the selected item value in the Combobox cell, it is disappearing because of Cell Formatting event always fires and re-instantiates the combo cell to default value.
If I disable Cell Formatting event code, I can see the value is retained in the combobox cell and it works
Please let me how to solve this issue, because I have to use Cell Formatting evetn for various conditions, So I can not disable the code.
give an idea or code sample to retain selected values in the combo cells on usage cell formatting event
Thank you
Shyam Sundar
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I've done a simple custom label in .net 2.0 that allows a border color to be set. The problem is I can't get the control to repaint if another form is dragged over the control. I've tried the SetStyle() method and it doesn't seem to help.
public partial class BorderLabel: Label
{
public BorderLabel()
{
InitializeComponent();
this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);
}
private Color _borderColor = Color.Black;
public Color BorderColor
{
get { return _borderColor; }
set
{
_borderColor = value;
Invalidate();
}
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
int borderWidth = 1;
ControlPaint.DrawBorder(e.Graphics, e.ClipRectangle, _borderColor,
borderWidth, ButtonBorderStyle.Solid, _borderColor, borderWidth,
ButtonBorderStyle.Solid, _borderColor, borderWidth, ButtonBorderStyle.Solid,
_borderColor, borderWidth, ButtonBorderStyle.Solid);
}
}
What other events should I be overriding to cause the control to repaint when a form is dragged over the control?
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Change your ControlPaint to "e.Graphics":
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
int borderWidth = 1;
e.Graphics.DrawBorder(e.Graphics, e.ClipRectangle, _borderColor,
borderWidth, ButtonBorderStyle.Solid, _borderColor, borderWidth,
ButtonBorderStyle.Solid, _borderColor, borderWidth, ButtonBorderStyle.Solid,
_borderColor, borderWidth, ButtonBorderStyle.Solid);
}
Use the Graphics object you are given in the event arguments, not your own.
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Thanks but what fixed it was not using the e.ClipRectangle, but using the ClientRectangle object instead.
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