Re: comobox.SelectedValue - C# Discussion Boards

Re: comobox.SelectedValue

Brett Slaski11-Oct-04 7:22

Brett Slaski

11-Oct-04 7:22

You need to cast the value.

E.g. int theInt = (int) ComboBox.selectedValue;

Re: comobox.SelectedValue

webhay11-Oct-04 7:32

webhay

11-Oct-04 7:32

Thanks to reply me but i did this casting but it give me this message
specified cast is not Valide

Thanks for your time please help me

Re: comobox.SelectedValue

Alex Korchemniy11-Oct-04 9:24

Alex Korchemniy

11-Oct-04 9:24

I'm not quite sure what you are trying to do but you can always use the debugger watch windows to determine the type of the object.

Re: comobox.SelectedValue

Brett Slaski11-Oct-04 10:33

Brett Slaski

11-Oct-04 10:33

How are you loading the combo?

Re: comobox.SelectedValue

webhay11-Oct-04 11:36

webhay

11-Oct-04 11:36

this my code:

private void cob_SelectedValueChanged(object sender, System.EventArgs e)
{
label1.Text = cbo.SelectedValue.ToString();
SqlConnection cnn = new SqlConnection();
cnn.ConnectionString = "workstation id=UNKNOW;packet size=4096;user id=sa;data source=UNKNOW;persist security info=False;initial catalog=TestDB;";
SqlCommand cmd = cnn.CreateCommand();
cmd.CommandType = CommandType.Text;
//int x = (int)cbo.SelectedValue;
cmd.CommandText = "Select * from Val Where Cat_ID = "+cbo.SelectedValue+"";
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds);
lst.DataSource = ds.Tables[0];
lst.DisplayMember = "Val_Name";
lst.ValueMember = "Cat_ID";
}

Thanks for your time ....

haytham

Re: comobox.SelectedValue

Anonymous11-Oct-04 15:50

Anonymous

11-Oct-04 15:50

I assume that this is working ok? Or is it Returning the object name? If not, how are you filling the combobox, databind or by item? SelectedValue is only used with databinding, a ValueMemeber must be set.
webhay wrote:
label1.Text = cbo.SelectedValue.ToString();

The following will not work because it will return the object name.
webhay wrote:
cmd.CommandText = "Select * from Val Where Cat_ID = "+cbo.SelectedValue+"";

Re: comobox.SelectedValue

webhay12-Oct-04 3:48

webhay

12-Oct-04 3:48

i filled the combobox with databind :

SqlConnection cnn = new SqlConnection();
cnn.ConnectionString = this.ConnStr;
SqlCommand cmd = cnn.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = this.SelectCommand;
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds);
combobox.DataSource = ds.Tables[0];
combobox.DisplayMember = ds.Tables[0].Columns["Client_Name"].ToString();
combobox.ValueMember = ds.Tables[0].Columns["Client_ID"].ToString();

Re: comobox.SelectedValue

Brett Slaski12-Oct-04 4:05

Brett Slaski

12-Oct-04 4:05

webhay wrote:
combobox.DataSource = ds.Tables[0];
combobox.DisplayMember = ds.Tables[0].Columns["Client_Name"].ToString();
combobox.ValueMember = ds.Tables[0].Columns["Client_ID"].ToString();

You are not properly binding your combobox. Try this:
combobox.DataSource = ds;
combobox.DisplayMember = "TableName.Client_Name";
combobox.ValueMember = "TableName.Client_ID";

Note it is not recomended to use `ds.TableName' for the datasource.

Re: comobox.SelectedValue

webhay12-Oct-04 14:02

webhay

12-Oct-04 14:02

Thanks Brett Rose | [Rose]

it is working now you are so helpful
thanks for your time

and it is working in early binding too...
Big Grin | :-D

Regards
webhay

Re: comobox.SelectedValue

webhay12-Oct-04 14:05

webhay

12-Oct-04 14:05

Thanks Brett Rose | [Rose]

it is working fine now.you are so helpful....
Thanks for your time....

it is working in Erely binding tooo...

Smile | :)

;)

regards
webhay

Writing TreeView Contents To XML

enchantingdb11-Oct-04 3:15

enchantingdb

11-Oct-04 3:15

I am writing an RSS reader in C# and I'm trying to write the contents of a TreeView to an XML file. I have tried using XmlWriter and have managed to write simple tree structures but I get confused when it comes to dealing with complex tree structures such as those that have multiple folders and sub folders.

I have tried searching Code Project and the Net but haven't had much joy in finding a solution. I have only been using C# for a few months and my programming knowledge is fairly limited.

Is XmlWriter the best way to write out a TreeView? How would you go about going through each of the folders and writing the feeds within them?

If there is anything else that I need to include let me know.

Re: Writing TreeView Contents To XML

Alex Korchemniy11-Oct-04 9:17

Alex Korchemniy

11-Oct-04 9:17

Not a very popular article but you can try: http://www.thecodeproject.com/csharp/treeviewtoxml.asp

XmlWriter should be very easy. If you run into any problems try using the XmlDocument instead.

how to swap two tree nodes??

khchan11-Oct-04 1:35

khchan

11-Oct-04 1:35

hi..

let say i have 3 nodes in a TreeView
and i wanna swap the 2nd and the 3rd node..

here is my code segment.. but it doesn't work

TreeNode tempNode = treeView1.Nodes[1];

treeView1.Nodes[1] = treeView1.Nodes[2];
treeView1.Nodes[2] = tempNode;

the tree becomes a 5-node tree like this:
Node0
Node2
Node1
Node1
Node2
Confused | :confused:

Re: how to swap two tree nodes??

J4amieC11-Oct-04 3:03

J4amieC

11-Oct-04 3:03

you must remove and re-add the nodes as the setter in TreeView.Nodes[int] actually does an Insert.

<br />
TreeNode node1 = treeView1.Nodes[1];<br />
TreeNode node2 = treeView1.Nodes[2];<br />
treeView1.Nodes.Remove(node1);<br />
treeView1.Nodes.Remove(node2);<br />
treeView1.Nodes.Add(node2);<br />
treeView1.Nodes.Add(node1);<br />

How to make C# application run on win2000 and WinMe and Win98?

momer11-Oct-04 1:23

momer

11-Oct-04 1:23

It seems we have to install the whole .net framwork before run c# application on WinXP.But even if I install the .net framwork 1.1 package on Win2000,my C# application still cannt run on it.Since C# is better than VC++,why the application developed with it has such a unbearable restriction?
If we have to asked our users to install the .net framwork before run our application? or if there someother way to let our C# application run fluently on WinXP,Win2000,WinMe,Win98?
Thanks
momer

Re: How to make C# application run on win2000 and WinMe and Win98?

Anonymous11-Oct-04 1:36

Anonymous

11-Oct-04 1:36

Well, same situation here, different results:

Developing apps for the company under WinXP with VS.NET 2003 Enterprise Architect, Clients running Win2000 Prof with installed .NET-FW. No problems at all.

The FRAMEWORK should be available for Windows 98SE and higher, btw. Do not try and install the SDK on Win98.

But even that should work under W2K.

Maybe you have deployed your app for the 1.0 Framework and installed the 1.1 Framework on your client?

Installing the FW as admin should work. There may be a problem with your config, I have not encountered any probs with .NET so far.

You could just be "not quite lucky" Wink | ;)

Cheers
Sid

Re: How to make C# application run on win2000 and WinMe and Win98?

J4amieC11-Oct-04 2:53

J4amieC

11-Oct-04 2:53

momer wrote:
unbearable restriction?
If we have to asked our users to install the .net framwork before run our application?

Would it not have been wise to investigate the .NET platform before development?

Re: How to make C# application run on win2000 and WinMe and Win98?

Colin Angus Mackay11-Oct-04 3:12

Colin Angus Mackay

11-Oct-04 3:12

J4amieC wrote:
Would it not have been wise to investigate the .NET platform before development?

Eek! | :eek:

But that would have eaten in to valuable coding time. Gotta ship the project on time you know. Roll eyes | :rolleyes:

Do you want to know more?

Vogon Building and Loan advise that your planet is at risk if you do not keep up repayments on any mortgage secured upon it. Please remember that the force of gravity can go up as well as down.

Re: How to make C# application run on win2000 and WinMe and Win98?

Gary Thom11-Oct-04 3:04

Gary Thom

11-Oct-04 3:04

even if I install the .net framwork 1.1 package on Win2000,my C# application still cannt run on it.

I'm not sure what you are trying to say here. I develop C# 1.0 & 1.1. on both XP and Win 2000, I have never had any trouble running on 2000.

Specifically, what fails?

Gary

Re: How to make C# application run on win2000 and WinMe and Win98?

Anonymous11-Oct-04 6:42

Anonymous

11-Oct-04 6:42

Hi,Gary,
At first thank you all!
Yes,you are right,I am a new hand with .net. I am very glad to know that it was my fault.
But one fact is that when I run my app on 2000,the following error occurs:
.NET Framework initialization error
C:\WINNT\Microsoft.NET\Framework\v1.0.3705\mscorwks.dll could not be loaded
That it is. I believe the trouble is not about the .net framework itself,but some other matter I not know at present.
So,I need your help.
momer

Re: How to make C# application run on win2000 and WinMe and Win98?

Dave Kreskowiak11-Oct-04 7:50

Dave Kreskowiak

11-Oct-04 7:50

It would appear that your app was developed using one version of the .NET Framework and deployed under a different version.

What version of Visual Studio .NET are your using? What version of the .NET Framework is installed on the 2000 machine?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: How to make C# application run on win2000 and WinMe and Win98?

momer11-Oct-04 15:17

momer

11-Oct-04 15:17

Hi,Dave,
Thanks!
I know what the problem is. The version of Visual Studio.net is v1.0.3705,but the version of the .net framework installed on the 2000 is v1.1.
I am sorry I made a mistake.
Thank you again!
momer

help tifaa memory problem

tifa11-Oct-04 0:39

tifa

11-Oct-04 0:39

hiii every body i have an apllication that consiste of a main form which have a main menu from which i open forms using (ShowDialog) every time i open the form and close it a new object created and the old one still in memory i noticed that using memory profiler i dispose the form and set it to null but it is still in memory this is because the form is still refrenced by a threadstart object which is refrenced by a thread object which i have create inside the form but it has finished i don't know why it is still refrence the form
please anybody know how can overcome this problem

dfds

Re: help tifaa memory problem

Dave Kreskowiak11-Oct-04 6:28

Dave Kreskowiak

11-Oct-04 6:28

Have you been disposing the dialog form once your done with it?

Form2 testDialog = new Form2();
testDialog.ShowDialog(this);
testDialog.Dispose();

If you don't .Dispose() the dialog, you'll keep creating instances that are never cleaned up. Read the docs[^] on Form.ShowDialog() for more information on how this method works.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

hexedecimal in C#

mitreviper11-Oct-04 0:31

mitreviper

11-Oct-04 0:31

Hi guys,

In VB the representation for hexedecimal is &H1 . How do you write this in C# . Please help. i'm running out of time.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.