Error in CommonClass.cs the name 'gvwBoarding' doesnot exist in current context

CommonClass.cs Error raising on this page
Error: The name 'gvwBoarding' doesnot exist in current context.

BusRouterHeader.aspx.cs
gvwBoarding is a Gridview id in BusRouterHeader.aspx.cs page


protected void btnSave_Click(object sender, EventArgs e)
       {
           string re = "Given Field is Empty";
           if (ddlBusTravelsName.SelectedIndex.ToString() != "0" && txtAmount.Text != "" && txtFromCity.Text != "" && txtToCity.Text != "" && txtDepartureTime.Text != "" && txtArrivelTime.Text != "")
           {
               DoFill();
               string res = CC.DoInsertBusRHeader(B);
               ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + res + "');", true);
               Clear();
               CC.DoGdviewBoarding(); //I will call this method...... 
               
           }
           else
           {
               ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + re + "');", true);
           }
       }

CommonClass.cs
public void DoGdviewBoarding()
        {
            SqlCommand cmd;
            try
            {
                SqlDataAdapter sda;
                DataSet ds;
                mDbconnection = conn.GetDefaultDbConnectionString();
                cmd = new SqlCommand("[DBO].[Proc_GetBoarding]", mDbconnection);
                cmd.CommandType = CommandType.StoredProcedure;
                sda = new SqlDataAdapter(cmd);
                ds = new DataSet();
                sda.Fill(ds, "BusRouterHeaderMaster");
                gvwBoarding.DataSource = ds;
                gvwBoarding.DataBind();
                mDbconnection.Close();
            }
            catch (Exception e)
            {

            }
            finally
            {
                if (cmd != null)
                    cmd.Dispose();
                cmd = null;
                mDbconnection.Close();
            }
        }