c# AcceptButton and validation

Question

Hi I have a form which contains of several textboxes and two buttons Cancel and Ok. These buttons are assigned to accept and cancel buttons properties in form. The problem is that I have to validate texts entered in all textboxes.

I want to do that if user click Ok button(which is acceptButton). So I wrote a function which is reponsible for validation and I fire this function if user click Ok button. The problem is that I can't stop form from closing even if validation function return false. It happens because of the fact that I assigned acceptbutto property to my Ok button. Is there any way to prevent form from closing if validation fails without removing acceptbutton properties ??

Answer 1

This is the working solution we use (and it's kinda compiled from other answers).

You just have to set the DialogResult to None to prevent the form from closing.

//form init, auto-generated code (this is the case described) private void InitializeComponent() {     //....     this.AcceptButton = btnOk;     this.btnOk.DialogResult = DialogResult.OK;     //.... }  //event handlers private void btnOK_Click(object sender, EventArgs e) {     if (!Validate())         this.DialogResult = DialogResult.None; }  private void Form_FormClosing(object sender, FormClosingEventArgs e) {     if (this.DialogResult == DialogResult.None)         e.Cancel = true; } 

Answer 2

In the Ok button click handler change DialogResult to DialogResult.None when validation fails