Event Not Fired On Editing Control Of Datagridview

Question

There is strange problem I am facing that I have custome datagridview in my application and I am trying to fire even on Editing ControlShowing Event Of datagridview as below:

private void newdgv_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)

{

TextBox tbox = e.Control as TextBox;

if (newdgv.CurrentCell.ColumnIndex == 0)

{

tbox.TextChanged+=new EventHandler(tbox_TextChanged);

tbox.KeyDown += new KeyEventHandler(tbox_KeyDown);

}

private void tbox_KeyDown(object sender, KeyEventArgs e)

{

if (e.Control && e.KeyCode == Keys.C)

{

CashShortAC4 csa4 = new CashShortAC4();

csa4.Bt_Click += new CashShortAC4.CShortAC1(csa4_Bt_Click);

csa4.Show(this);

}

private void tbox_TextChanged(object sender, EventArgs e)

{

TextBox tbox = (TextBox)sender;

if (tbox.Text.Length > 2)

{

listBox2.Visible = true;

button2.Visible = true;

int inddex = listBox2.FindString(tbox.Text);

if (inddex != -1)

{

listBox2.SetSelected(inddex, true);

listBox2.Focus();

tbox.TextChanged -= new EventHandler(tbox_TextChanged);

}

The tbox TextChanged event working very well but tbox keydown event not working. When I Press Ctrl+C on Editing Control like textbox it's not showing me the concern new form CashShortAC4. I don't know what is wrong in my application. How to solve the problem?.

Sam Hobbs · Answer

It could be that Ctrl-C is special and is therefore not sent to the your program. I tried to test that in a small sample program but I was unable to duplicate the problem but perhaps there is something in your application that is causing what you are getting. There are various things you can use the debugger to diagnose the problem such as a breakpoint or Debug.Print; I would use one of them or something similar. Also create a small program to attempt to duplicate what your main program is doing.

mahesh waghela · Answer

Yes Sam You are right I will try it again and let you know later

mahesh waghela · Answer

hi Sam It's very strange when I change my tbox keyvent handller as below : if (e.Alt && e.KeyCode == Keys.C) { CashShortAC4 csa4 = new CashShortAC4(); csa4.Bt_Click += new CashShortAC4.CShortAC1(csa4_Bt_Click); csa4.Show(); } the above execute the code but why not execute on Control key. It's a very very strange problem I am facing.

Sam Hobbs · Answer

If the KeyDown event handler is not executing when it should then that certainly gives you a big clue to the problem. I wish I could help more but I don't know what to suggest. I hope there is an easier way to do what you need to do because it does look complicated. If I knew that I could figure out the problem by looking closer at the code you have posted then I would do that.

mahesh waghela · Answer

Yes Sam The tbox.KeyDown+=new KeyEventHandler(tbox-Keydown)is seem likely to be hit but don't know why it's not execute. I think something serious problem in my application and I have to find out but it will take a time.

Sam Hobbs · Answer

Your code works for me however you might want to add e.SuppressKeyPress = true; to tbox_KeyDown when relevant. Try using the debugger; put a breakpoint in tbox_KeyDown and on the line tbox.KeyDown += new KeyEventHandler(tbox_KeyDown); and debug and then type something into the textbox. If the breakpoint for the adding of the keydown event is not hit then you know that the keydown event handler will never execute. If the event handler does execute then you can look at the KeyEventArgs to see what is actually iin there.