Set text box read only property on grid view row data bound column this way user can't enter into text box.
If not solve your problem paste you code here.
Use this code on row data bound:
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers == Keys.Control)
{
e.Handled = true;
textBox1.SelectionLength = 0;
}
}
Or
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Control == true)
{
MessageBox.Show("Cut/Copy and Paste Options are disabled");
}
}
Accept as answer and vote if solve your problem.