C#: ShowDialog() keeps returning DialogResult.Cancel

When you call a dialog with dlg.ShowDialog() and check the result, you may find it always returning DialogResult.Cancel.

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01.private void AddItem()

02.{

03.  FormAdd dlgAdd = new FormAdd();

04.  DialogResult res = dlgAdd.ShowDialog(this);

05. 

06.  if (res != DialogResult.OK)

07.  {

08.    return;

09.  }

10. 

11.  // All good to go here

12.}

So with your dialog, ensure that the correct "AcceptButton" property has been set to the correct button.

A simple mistake to make is to forget setting the result when you click OK/Save/etc.

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1.private void btnAdd_Click(object sender, EventArgs e)

2.{

3.  // Do some validation here

4. 

5.  this.DialogResult = DialogResult.OK;

6.}

That should set the correct value by the time the dialog is closed.