C# Discussion Boards - CodeProject

Re: Time entry 'lost' in dtp

11-Oct-04 15:59

Thanks, Most of what I have seen are asp.net controls. Most of the winforms stuff is overkill. I will take a look at the links.

Time entry 'lost' in dtp

DF_Bandit11-Oct-04 7:18

DF_Bandit

11-Oct-04 7:18

I am using a dtp on a form that has an OK button. If the user changes the hour on the dtp and hits the enter key, the OK button_Click event fires without the dtp hour getting updated. How can I prevent this behavior?

For example:
before entry, the dtpMyControl.Value.Hour == 1
the user enters a change so the control looks like 05:59:59
then hits the enter key (the '05' being highlighted)
the validation code that reads the hour still has dtpMyControl.Value.Hour==1.

DF_Bandit11-Oct-04 12:59

DF_Bandit

11-Oct-04 12:59

I found my answer.

simply add a Focus call in the _Click handler like so:

private void buttonOK_Click(..)
{
...
buttonOK.Focus(); // If the dtp (or other) control didn't loose focus, it does now
...
}

Time stamp

wk_vigorous11-Oct-04 6:51

wk_vigorous

11-Oct-04 6:51

Hi, guys
I need a time stamp, which can remember time when the source code is compiled for the first time. So DateTime.Now is useless.
How can I get it?
Thank you very much.

vigorous

Re: Time stamp

Heath Stewart11-Oct-04 10:56

Heath Stewart

11-Oct-04 10:56

You mean like the "File Created" date that every file on FAT/32, NTFS, and most other file systems has? If you want to access this from code, use the FileInfo class along with the local path of your assembly, which you can get form Assembly.GetExecutingAssembly().Location.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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Hashtable Item

3green11-Oct-04 5:32

3green

11-Oct-04 5:32

I know I am doing something silly, but I cant seem to access the Item property of a Hastable:

Hashtable myHash = new Hashtable();
myHash.Item;

Produces a build error
"System.Collections.Hashtable does not contain a definition for 'Item' "
But it sez in help that Item is a public property of Hashtable. Am using VS2003 Enterprise with Frameworks 1.1 SP1
Many thanks

Re: Hashtable Item

Brian Nottingham11-Oct-04 6:07

Brian Nottingham

11-Oct-04 6:07

In C# the "Item" property is accessed using indexer syntax. So instead you would write something like this.

Hashtable myHash = new Hashtable();
object value = myHash[key];

Re: Hashtable Item

Charlie Williams11-Oct-04 6:11

Charlie Williams

11-Oct-04 6:11

The Item property of HashTable is the indexer in C#. You access it using this syntax:

object val = myHash[objKey];

Charlie

if(!curlies){ return; }

Making function DragDrop to a treeNode

ee9903511-Oct-04 5:22

ee99035

11-Oct-04 5:22

Hi there!!

I´m having problems here. I want to make a drag and drop operation with a TreeNode of a treeview. I found that if I want to make the drag and drop operation with the TreeView it is possible. I just want to know if it is possible to make the same operation with only one node of the treeView.

Thanks for your help, Sérgio

Re: Making function DragDrop to a treeNode

Heath Stewart11-Oct-04 10:35

Heath Stewart

11-Oct-04 10:35

That's what the TreeView.ItemDrag event is for. It fires when you begin dragging a TreeNode. To handle dragging and dropping within the TreeView, you additionally handle the DragOver and DragDrop events at a minimum.

There is actually a good example of handling these events in the documentation for the TreeView.ItemDrag event in the .NET Framework SDK.

Note that unless you serialize your TreeNode it will not be available to other applications (or AppDomains - without marshaling in the source application).

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles] [My Blog]

comobox.SelectedValue

webhay11-Oct-04 5:02

11-Oct-04 5:02

i assigne a number from Databaseto ValueMemeber in combobox.and i tryed to use it from ComboBox.SelectedValue but it return an object type but i need the number on this object for select a value in another Table but is not working.

Thnaks i need help please Frown | :(

Brett Slaski11-Oct-04 7:22

11-Oct-04 7:22

You need to cast the value.

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

webhay11-Oct-04 7:32

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

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.

Brett Slaski11-Oct-04 10:33

11-Oct-04 10:33

How are you loading the combo?

webhay11-Oct-04 11:36

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

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+"";

webhay12-Oct-04 3:48

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();

Brett Slaski12-Oct-04 4:05

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.

webhay12-Oct-04 14:02

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

webhay12-Oct-04 14:05