Public partial class Check_UnCheck_All : FormĭataGridView1.AllowUserToAddRows = false It keeps functionality for both mouse and keyboard. This makes the two controls behave like the checkbox column in Gmail. To set the checked state of a DataGridViewCheckBoxCell use: foreach (DataGridViewRow row in dataGridView1.Rows)ĭ(true) įor anyone else trying to accomplish the same thing, here is what I came up with. I was making my own version of a Checkbox to control a DataGridViewCheckBoxColumn when I saw this post wasn't actually answered. If (chk.Value = chk.FalseValue || chk.Value = null) Private void chkItems_CheckedChanged(object sender, EventArgs e) This code is working note setting the TrueValue and FalseValue in the Constructor plus also checking for null: public partial class Form1 : FormĭataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn() ĭ(CheckboxColumn) private void chkItems_CheckedChanged(object sender, EventArgs e)įoreach (DataGridViewRow row in dataGridView1.Rows)ĭataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells So going by its example your code should looks something like this:( this is completely untested)Įdit: it seems that the Default for Cell.TrueValue for an Unbound DataGridViewCheckBox is null you will need to set it in the Column definition. Looking at this MSDN Forum Posting it suggests comparing the Cell's value with Cell.TrueValue.
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