private void txtUsrname_TextChanged(object sender, EventArgs e) { if (string.IsNullOrEmpty(txtUsrname.Text)) { return; } //Check if Username already exists qry = "select USPUSERNAME from userprivilege where USPUSERNAME = '******'"; if (objData.returnFirstCell(qry) != null) { MessageBox.Show("Username already Exists." + Environment.NewLine + "Please try again.", "Incorrect Input", MessageBoxButtons.OK, MessageBoxIcon.Error); txtPass.Text = string.Empty; txtUsrname.Focus(); txtUsrname.Text = string.Empty; txtConPass.Text = string.Empty; //reflect values in user inherited status bar return; } }