Confirmation message box in webapplication

Question

Am using the below message box in asp.net web application. Now i want to convert this message box as a confirmation message box and do something when it is true else means r

Answer 1

private void showMessage(string msg){

        ScriptManager.RegisterStartupScript(this, this.GetType(), "temp", "", false);

protected void BtnReg_Click(object sender, EventArgs e) {

        OracleHelper.OracleDBOpen();
        object flag = OracleHelper.OracleExecuteScalar("your select Query ");
        if (flag == null)
        {
                      showMessage("Failed !!! ");

        }
        else
        {
            string reg = String.Format("your Insert Query ");

            showMessage("successfuly");
            OracleHelper.OracleExecuteNonQuery(reg);

        }                
        OracleHelper.OracleDBClose();
    }
}