triggering events by code

Mridang Agarwalla

i have a checkbox on my form and i have written a few lines of code on the checkbox.checkchanged event which fires everytime u check or uncheck the box. This works fine till u check it by clicking on it at runtime but the event doesnt fire when I type checkbox.checked = true. How cn i make the event fire through code..

Jay Shankar

If checkbox.Checked is already true, and you write the checkbox.checked = true, then checkbox.checkchanged will not fire, since the checkState is not being changed, Otherwise it will fire. Check using the statement like

this.checkbox.Checked = !this.checkbox.Checked;

BTW, If you want to call the eventHandler from any where else call like below

this.checkBox1_CheckedChanged(this, new System.EventArgs());

Mridang Agarwalla

hi jay, my code doesnt seem to fire when i type checkbox1.checked = true; even thouhg my checkbox state is false. please subscribe to this thread so i can reply

Jay Shankar

Hi Mridang, First of all, please go through the msdn documents CheckBox.CheckedChanged[^] It should fire. There is no bug in the .net, concerning this. As I said in my previous post, check using again.

this.checkbox.Checked = !this.checkbox.Checked;

or

private void ChangeCheckBoxState(CheckBox cbx)
{
cbx.Checked = !cbx.Checked;

System.Diagnostics.Debug.WriteLine("checked state transformed to  " + this.checkBox1.Checked);

}

//

private void checkBox1_CheckedChanged(object sender, System.EventArgs e)
{
MessageBox.Show("Check Changed");

}

You can explicitly also call the event handler, just to reconfirm as

this.checkBox1_CheckedChanged(this, new System.EventArgs());

I would also advice you to prepare a simple demo project to check the above phenomenon. Regards, Jay.