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;
}