private void btnGetSalary_Click(object sender, EventArgs e) { SqlParameter parameterId = new SqlParameter("@Id", SqlDbType.Int); SqlParameter parameterSalary = new SqlParameter("@Salary", SqlDbType.Money); parameterSalary.Direction = ParameterDirection.Output; parameterId.Value = txtId.Text; DatabaseUtility.ExecuteStoredProcedureNonQuery("GetSalary", parameterId, parameterSalary); if (parameterSalary.Value == DBNull.Value) { MessageBox.Show("0"); } else { MessageBox.Show(parameterSalary.Value.ToString()); } }