Question

I’m creating a bunch of Checkboxes dynamically:

CheckBox chkRead = new CheckBox();
chkRead.ID = "chk1";
chkRead.AutoPostBack = true;
chkRead.CheckedChanged += new EventHandler(CheckBox_CheckedChanged);

CheckBox chkPost = new CheckBox();
chkRead.ID = "chk2";
chkPost.AutoPostBack = true;
chkPost.CheckedChanged += new EventHandler(CheckBox_CheckedChanged);


 protected void CheckBox_CheckedChanged(object sender, EventArgs e)
 {
     CheckBox chk = (CheckBox)sender;


 }

What I want to do is the following:
When I check the chkPost CheckBox I want the chkRead CheckBox to be checked as well

In the CheckBox_CheckedChanged event I only have access to the CheckBox that was clicked
but I don’t know how to check the other checkbox from that event.

Answer 1

This is from memory, but you could do something like this:

protected void CheckBox_CheckedChanged(object sender, EventArgs e)
{
    CheckBox chk = (CheckBox)sender;
    CheckBox chkPost = (CheckBox) chk.NamingContainer.FindControl("chk2");
    CheckBox chkRead = (CheckBox) chk.NamingContainer.FindControl("chk1");
    if(chk == chkPost && chk.Checked)
    {  
        chkRead.Checked = true;
    }
} 

This is assuming you want to do all this in code-behind, after postback. If you want to do it in javascript, that’s a different question.

This also assumes that chk1 and chk2 are in the same naming container. If they aren’t, things will get complicated.