ASCII LpSTR? - C# Discussion Boards

Blumen29-May-07 23:56

29-May-07 23:56

Hi,

I declare a HashTable as a class variable, and assign values to it inside a private fuction. I try to access the HashTable in another function, but the order of the Keys added is lost.

If I have added keys in the order 1, 2 and 3 (with its Value), when I access the HashTable the order is lost, it may be in 2-3-1 order or some other order.

Usually hashtable retains the order, could anyone point what going wrong here.

Regards,
Blumen

Re: HashTable sort order

Martin#30-May-07 0:07

Martin#

30-May-07 0:07

Hello,

No Hashtable is not holding the order.
An ArrayList does.

All the best,

Martin

Re: HashTable sort order

CPallini30-May-07 0:15

CPallini

30-May-07 0:15

As pointed out already by Martin#, the key order of insertion is not retained, for instance, see the sample code given in
http://msdn2.microsoft.com/en-us/library/system.collections.hashtable.add.aspx[^]
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: HashTable sort order

sujithkumarsl30-May-07 1:25

sujithkumarsl

30-May-07 1:25

you can use sorted list, if you want that in an order

My small attempt...

Re: HashTable sort order

leppie30-May-07 4:51

leppie

30-May-07 4:51

Hashtable never orders the keys. You can NEVER rely on that. Use a SortedList instead.

xacc.ide-0.2.0.57 - now with C# 2.0 parser and seamless VS2005 solution support!

failed to load view state

tauras8129-May-07 23:49

tauras81

29-May-07 23:49

hi,
i hava following error :

Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.]
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +483
System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +195
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +424
System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +195
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +424
System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +195
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +424
System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +195
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +424
System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +195
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +424
System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +195
System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +424
System.Web.UI.Page.LoadAllState() +559
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2237

--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210

can any body tell the solution

Re: failed to load view state

leppie30-May-07 4:53

leppie

30-May-07 4:53

You need to reset the page's viewstate after adding the controls dynamically, then it will recreate it, and all should be fine.

xacc.ide-0.2.0.57 - now with C# 2.0 parser and seamless VS2005 solution support!

ASCII LpSTR?

Russell Jones29-May-07 23:41

Russell Jones

29-May-07 23:41

I'm trying to make a call into a compression dll

This is declared like this in VB6:

<br />
Private Declare Function compress Lib "compression.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long<br />
Private Declare Function uncompress Lib "compression.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long

I've added the following to a c# class

<br />
   [DllImport("compression.dll")]<br />
      public static extern int uncompress(ref byte[] inputBuffer, ref int inputLength, ref byte[] outputBuffer, int OutputLength);<br />
      [DllImport("compression.dll")]<br />
      public static extern int compress( [MarshalAs(UnmanagedType.LPStr)]  StringBuilder inputBuffer,ref  int inputLength,  [MarshalAs(UnmanagedType.LPStr)]  StringBuilder outputBuffer, int OutputLength);

If i call the compress method using c# and decompress using c# this works fine. The problem arises when i try to compress in c# and decompress in vb6 or vice versa. Is there a back compatability mode for string functions like this?

Thanks in advance

Russell

Re: ASCII LpSTR?

Dave Herren30-May-07 1:21

Dave Herren

30-May-07 1:21

Russell Jones wrote:
The problem arises

What is the problem... an error message, invalid data, what? Please provide a little detail.

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Sub-classing

Shivaprasad D Atthigode29-May-07 23:27

Shivaprasad D Atthigode

29-May-07 23:27

what is sub-classing in C#, and hw to achive that.

Re: Sub-classing

MarkB77729-May-07 23:56

MarkB777

29-May-07 23:56

//a.k.a inheritance.

//so for example...

public class ClassOne : ClassBase
{
//this class is a subclass of ClassBase
}

public class ClassTwo : ClassBase
{
//this class is a subclass of ClassBase
}

public class ClassBase
{
protected int X = 5; // The two subclasses can access this variable as its been "inherited"
}

rich textbox

treah29-May-07 23:18

treah

29-May-07 23:18

i want to select the text written in the rich text box

Re: rich textbox

JoeSharp29-May-07 23:26

JoeSharp

29-May-07 23:26

hi
myrichtextbox.SelectAll():

regards

Re: rich textbox

NassosReyzidis29-May-07 23:27

NassosReyzidis

29-May-07 23:27

Hello treah,
with the RTFControl1.SelectionStart and RTFControl1.SelectionLength will give you the start and length (int) so you can get the text!
Hope that helps
Nassos

GanDad

Populate combobox

matjame29-May-07 23:00

matjame

29-May-07 23:00

Hi all.

Im trying to load data into a combo box during form load.The items Im trying to load are from a database.

Now here is my little code that gives me errors.

protected void Page_Load(object sender, EventArgs e)
{
con.ConnectionString = str;
String str1 = "Select * from Filter";
con.Open();
cm.Connection = con;
dtr = cm.ExecuteReader();
if (dtr.Read())
{
// Load FilterByKeys onto the combo box
cboExtension.Text = (dtr["FilterKey"]).ToString();<<*****Problem****
lblMessage.Text = "Good. All the values are loaded";

Thanx.

kagiso

Re: Populate combobox

Christian Graus29-May-07 23:06

Christian Graus

29-May-07 23:06

What a mess

matjame wrote:
con.ConnectionString = str;

what is str, and why is a member variable named so badly ?

matjame wrote:
String str1 = "Select * from Filter";

You never use this anywhere, so it's irrelevant to the rest of the code.

What is con, cm and dtr ? Why do you have badly named member variables like this, that probably could be local, and are not named in a way that means anything ?

matjame wrote:
cboExtension.Text = (dtr["FilterKey"]).ToString();<<*****Problem****

What's the problem ? Does it not compile ? Does it blow up ? What's the error message ?

This is also not going to do more than add one value into the combo box. That's what the Text property will do. To add items, make a collection the datasource, and if it's not a collection of strings, set the DisplayMember property.

All of this looks to me like you're making it up as you go and hoping it will work. Intellisense is no substitute for reading MSDN or buying a good book as a reference.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Populate combobox

matjame29-May-07 23:21

matjame

29-May-07 23:21

Im not a c# code, so Im learning.

dtr is a datareader.
cm is a command
cn is a connection Sigh | :sigh:

kagiso

Re: Populate combobox

sujithkumarsl29-May-07 23:15

sujithkumarsl

29-May-07 23:15

DataTable status = new DataTable();
status = ExecuteNonQuery_SP("Select * from Filter");//getting the value
cmbStatus.DataSource =status ;
cmbStatus.DisplayMember = "Status_Name";
cmbStatus.ValueMember = "Status_Id";

give the displaymember and valuemember to the combobox'x object
here cmbStatus is the combobox

My small attempt...

Re: Populate combobox

J4amieC29-May-07 23:42

J4amieC

29-May-07 23:42

sujithkumarsl wrote:
status = ExecuteNonQuery_SP("Select * from Filter");//getting the value
cmbStatus.DataSource =status ;

---

How to get answers to your questions[^]

Re: Populate combobox

sujithkumarsl29-May-07 23:58

sujithkumarsl

29-May-07 23:58

status = ExecuteNonQuery_SP("Select * from Filter");//getting the value
cmbStatus.DataSource =status ;

actually ExecuteNonQuery_SP("Select * from Filter"); is a method which takes quaery as parameter and returns the datatable.
i used this code in my proj and its working

My small attempt...

Re: Populate combobox

J4amieC30-May-07 0:58

J4amieC

30-May-07 0:58

sujithkumarsl wrote:
actually ExecuteNonQuery_SP("Select * from Filter"); is a method which takes quaery as parameter and returns the datatable.
i used this code in my proj and its working

Two things:

1) There is no method named ExecuteNonQuery_SP in the framework, and therefore using it in an example to a newer programmer is just going to confuse them more! This method is most likely defined in your own project, or is part of a data access framework that you use.

2) The name of the method would imply that it executes IDbConnection.ExecuteNonQuery which does not "return a table". If your method really does take a SQL clause as a parameter and return a table it should be named ExecuteDataTable_SP

Please take the time to consider the usefulness of the code and the target audience before posting a (useless) code snippet.

---

How to get answers to your questions[^]

Re: Populate combobox

matjame30-May-07 0:48

matjame

30-May-07 0:48

Im using MS Access not SQL

kagiso

Re: Populate combobox

Shivaprasad D Atthigode29-May-07 23:38

Shivaprasad D Atthigode

29-May-07 23:38

what a mess is this!!

"cbo.extension.text" will never populate items in to combobox control, this only displays the specified text
if it is already there in combobox items collection.

to populate the items u should specifie
{
combobox.items.add(dtr["filterKey"].tostring());
}

Re: Populate combobox

matjame29-May-07 23:50

matjame

29-May-07 23:50

cboExtension.items.add(dtr["filterKey"].tostring());

items gives this error

"System.Web.UI.WebControl.DropdownList doesnt contain definition for items."

Then to .tostring()

"object doesnt contain a definition for string

Can you generate a code that would work.
NB. The Items in the database are jus A.B.C til Z
So, it suppose to load A
B
C
Till Z
Thank you for your help.A nice code would be nice.Im an amature in this

kagiso

Re: Populate combobox

sujithkumarsl30-May-07 0:00

sujithkumarsl

30-May-07 0:00

please try the exable which i gave to you. that will work
which field from db, you want to add in combobox?

My small attempt...

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