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Hi friends
How to read news from a rss feed in c#
thanks in advance-kk.tvm-
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You can use Rss Toolkit[^] or just parse it yourself as it is just an xml.
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I have a List of rows/classes returned from a strong-typed DataSet.
I've written a lambda statement on it to return all of the rows that match the lambda.
I pass the lambda statement through a Select method on the IEnumerable List.
At the end of the select method I have the option to select the Min() method.
However, the Min statement returns a bool from this implementation.
I'm trying to get the min value of the column referenced in the lambda.
What do I need to do to get the Min to return an int based on a given int column in the result set?
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Without seeing your code, it's impossible to say where you screwed up.
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As far as I have been able to tell setting e.Handled to true does absolutely nothing. I'm wondering why it's even available for the KeyDown event. Could someone please tell me?
I have looked at the documentation for the textbox control and the KeyDown checks the value and sets some class variable, then the KeyPress checks that variable and sets e.Handled based on the value of the variable.
Thank you.- Kalvin
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If you derive a class from TextBox, handle KeyDown event, and set Handled to true, that control will not pass the key press events to the underlying Win32 text box control, but it will still display the characters that the user typed. Set it to false so that the underlying Win32 text box control can do the default handling.
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Hello,
I am using a combo box in my Datagridview C# windows forms .Net 2.0,
I am adding the combo box at design time , it seems to work fine when I use the collection and populate it.
But when I fill the datagridview with fill command and the values from the fill command does not exist in the combobox I get an error.
So I need a combo box which is editable.So that user can select values from combo box or write his own values.
After populating the combobox. The values in the combo box must change according to the row selected.
Is it possible using datagridview.
Thanks if anyone would help
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I have two tables on a database where I need to gather information for a report. I have built a select statement and run it through an Odbc.DataReader. Stepping through the debugger, once ExecuteReader is executed the program stalls, for a period of minutes. Is there anyway to make this select statement more efficient?
The fields that start with INV are in the NINVREC table. The fields that start with MISCITEM are in the MISCITEM table.
The matching keys are MISCITEM-SERIAL-NBR and INV-MK-SERIAL-NBR.
The database is read only.
OdbcDataReader DbReader;
OdbcConnection DbConnection = new OdbcConnection("DSN=rsss");
OdbcCommand DbCommand = DbConnection.CreateCommand();
DbCommand.CommandText = "SELECT MISCITEM-DATE, MISCITEM-SERIAL-NBR, INV-MK-SERIAL-NBR, MISCITEM-MODEL-NBR, MISCITEM-CUST-ACCT-NBR, MISCITEM-EXCHANGE-MODEL-NBR, " +
" INV-SELL-PRICE,INV-ORIGINAL-COST, MISCITEM-ACTUAL-COST, MISCITEM-SALESMAN-1, MISCITEM-TICKET-NBR, MISCITEM-STORE FROM MISCITEM " +
" INNER JOIN NINVREC ON MISCITEM-SERIAL-NBR=INV-MK-SERIAL-NBR " +
" WHERE (MISCITEM-DATE >= '" + strEOMDate + "' AND MISCITEM-DATE <= '" + dtProcDate1.ToString("yyyy-MM-dd") + "') AND (INV-STATUS = 'S')" +
" GROUP BY MISCITEM-STORE, MISCITEM-DATE ORDER BY MISCITEM-STORE, MISCITEM-DATE";
try
{
DbConnection.Open();
DbReader = DbCommand.ExecuteReader();
while(DbReader.Read())Jude
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The query itself doesn't look like the problem.
Without really knowing the DB it's tough to say, but you might consider putting indexes on serial number columns in both tables. You might also include the MiscItem-Date in the index you create on the MiscItem table.
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| Unfortunately it is a read only database...or should I say we only have read only access for reporting purposes. Jude
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Is MISCITEM-DATE a DateTime or a SmallDateTime, there can often be issues when querying on columns and the optimzer decides to convert a datetime in order not to lose percision. This may be even more possible because you have the line MISCITEM-DATE <= '" + dtProcDate1.ToString("yyyy-MM-dd") + "'. I would try paramaterizing your query.
DbCommand.CommandText =
"SELECT MISCITEM-DATE, MISCITEM-SERIAL-NBR, INV-MK-SERIAL-NBR, MISCITEM-MODEL-NBR, MISCITEM-CUST-ACCT-NBR, MISCITEM-EXCHANGE-MODEL-NBR, " +
" INV-SELL-PRICE,INV-ORIGINAL-COST, MISCITEM-ACTUAL-COST, MISCITEM-SALESMAN-1, MISCITEM-TICKET-NBR, MISCITEM-STORE FROM MISCITEM " +
" INNER JOIN NINVREC ON MISCITEM-SERIAL-NBR=INV-MK-SERIAL-NBR " +
" WHERE (MISCITEM-DATE >= @Date1 AND MISCITEM-DATE <= @Date2) AND (INV-STATUS = 'S')" +
" GROUP BY MISCITEM-STORE, MISCITEM-DATE ORDER BY MISCITEM-STORE, MISCITEM-DATE";
DbCommand.Paramaters.Add("@Date1", OdbcType.DateTime)
DbCommand.Paramaters["@Date1"].Value = strEOMDate;
DbCommand.Paramaters.Add("@Date2", OdbcType.DateTime)
DbCommand.Paramaters["@Date2"].Value = dtProcDate1;
try
{
DbConnection.Open();
DbReader = DbCommand.ExecuteReader();
while(DbReader.Read())
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Thank you for the quick replies.
The definition for the table states DATE TIME for that field. I did a q&d query on the field and it returned in the format of mm/dd/yyyy hh:mm:ss am, but all of the times were 12:00:00 am.
I will try your solution and get back.Jude
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Did not like. I am receiving the error "Required text is missing. : at 350 : Next Token '@' "
Hmmm.....Jude
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Hmm sorry, looks like you have to specify your paramaters as a question mark in the actual query. I was going by my experience with SQLClient, try this
WHERE (MISCITEM-DATE >= ? AND MISCITEM-DATE <= ?) AND (INV-STATUS = 'S')"
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| True! Hmmm, but that seems to have broke it. It has been running in a console for about 10 minutes so far. One thing did change. The point of the stall is one step down in the program at the while(DbReader.Read()) statement. Jude
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Looks like it is an index problem then, it might be something you'll just have to live with.
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I edited the program and inserted a Timespan object. 27 minutes for the query! Ouch!
It doesn't matter to me, as the report gets generated on a Sunday while nobody is working. But it just seems like it should not take this long.Jude
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At some point you are going to need to get some optimisation done at the database level, indexes need to be created. That is why there are reporting databases and data warehouses. There is only so much you can do with query design.
You might try and get them to allow you to use a schema then you could take snapshots of the data and manipulate it to get some performance.Never underestimate the power of human stupidity
RAH
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Sorry for th late reply. I received more documentation on the keys and indexes today. Here are the keys and indexes for the NINVREC table:
Table Indexes
Name Number of Fields
Key 1 2
Fields:
INV-MK-MODEL-NBR Ascending
INV-MK-SERIAL-NBR Ascending
Key 2 1
Fields:
INV-SERIAL-NBR-KEY Ascending
Key 3 1
Fields:
INV-PRIMARY-SERIAL-NBR Ascending
Key 4 1
Fields:
INV-DATE-SOLD Ascending
Key 5 1
Fields:
INV-LOCATION-REC-1 Ascending
Key 6 1
Fields:
INV-TICKET-NBR Ascending
Here are the keys and indexes for the MISCITEM table:
Table Indexes
Name Number of Fields
Key 1 6
Fields:
MISCITEM-DATE Ascending
MISCITEM-HOUR Ascending
MISCITEM-MINUTE Ascending
MISCITEM-SECOND Ascending
MISCITEM-DUPLICATE-TIME Ascending
MISCITEM-STORE-KEY Ascending
Key 2 1
Fields:
MISCITEM-SALE-DATE Ascending
Key 3 3
Fields:
MISCITEM-CUST-ACCT-NBR Ascending
MISCITEM-TICKET-NBR Ascending
MISCITEM-TICKET-SEQ-NBR Ascending
Key 4 2
Fields:
MISCITEM-MODEL-NBR Ascending
MISCITEM-SERIAL-NBR Ascending
Key 5 2
Fields:
MISCITEM-EXCHANGE-MODEL-NBR Ascending
MISCITEM-EXCHANGE-SERIAL-NBR Ascending
Key 6 1
Fields:
MISCITEM-PENDING-SALE-DATE Ascending
So if I do a join on the INV-MK-MODEL-NBR-INV-MK-SERIAL-NBR and MISCITEM-MODEL-NBR-MISCITEM-SERIAL-NBR that should speed it up, correct?Jude
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Yowza! That too the 27 minute query to less than 4 seconds!
Thank you for all of your direction as I am not extremely fluent in SQL.Jude
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How to get all folders , subfolders and forms of my project !
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WHY?
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jojoba2010 wrote: WHY?
Your title means nothing and your question means little more. Try reading some books on C# and .NET, and doing some research, and then come back with a sensible question that refers to something you have actually done for yourself. If you are using these questions to learn how to write a program you are wasting everyone's time, including your own.MVP 2010 - are they mad?
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