btnClose is set to CausesValidation = false but not working

I have a close button on my form that I've set to `CausesValidation = false`. But when I run it and try to close it with ErrorProvider in effect it won't let me close. I've even tried adding to the close routine `errorProvider1.Clear()` or `errorProvider1.Dispose() but` still no luck closing the form until I take care of the error. What I have found to work is in the close if I loop over all the controls and set `CausesValidation=false` then it works as expected by closing the form despite any errors present. ``` private void btnAdd_Click(object sender, EventArgs e) { if (!this.ValidateChildren()) return; DoAddCommand(); } private void DoAddCommand() { //input string input1 = textBox1.Text; string input2 = textBox2.Text; //process this.ValidateChildren(); decimal sum = Class1.Add(input1, input2); //output lblSum.Text = sum.ToString(); } private void textBoxNumberEntry_Validating(object sender, System.ComponentModel.CancelEventArgs e) { TextBox textBox = sender as TextBox; decimal number1 = 0; try { number1 = decimal.Parse(textBox.Text); errorProvider1.Clear(); } catch (FormatException) { errorProvider1.SetError(textBox, "Enter a valid number"); e.Cancel = true; } } private void btnClose_Click(object sender, EventArgs e) { foreach (Control item in this.Controls) { item.CausesValidation = false; } this.Close(); } ```