private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) { if(Char.IsDigit(e.KeyChar) || e.KeyChar.ToString() =="." || e.KeyChar == 8) { //Indicate the System.Windows.Forms.Control.KeyPress event is not handled e.Handled = false; } else { e.Handled = true; } }
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