private void btnOk_Click(object sender, EventArgs e)
{
if (!chkEnabled.Checked || !string.IsNullOrEmpty(txtProgram.Text) && !string.IsNullOrEmpty(txtFile.Text) || (radParameter.Checked && !string.IsNullOrEmpty(txtParameters.Text)))
Close();
else
MessageBox.Show("Please make sure all relevant fields are completed");
}