C#

[DllImport("kernel32.dll")]
private static extern int Beep(int dwFreq, int dwDuration);

<asp:GridView ID="gvUsers" runat="server" CellPadding="4" ForeColor="#333333"
                GridLines="None" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True"
                OnRowEditing = "gvUsers_RowEditing" OnRowDeleting = "gvUsers_RowDeleting" OnRowUpdating = "gvUsers_RowUpdating" >
                <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
                <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
                <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
                <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                <AlternatingRowStyle BackColor="White" />

            </asp:GridView>


c# Code:

protected void Page_Load(object sender, EventArgs e)
    {

        if (Session["Office"] == null)
        {
            Response.Redirect("Login.aspx");
        }
        else
        {
            Session.Timeout = 1;
            L1.Text = "District:&nbsp;&nbsp;&nbsp;" + Session["district"].ToString();
            L3.Text = "Department:&nbsp;&nbsp;&nbsp;" + Session["department"].ToString();
            L4.Text = "Office:&nbsp;&nbsp;&nbsp;" + Session["Office"].ToString();

            con.Open();

            if (Session["department"].ToString() == "NIC")
            {
                SqlCommand cmd1 = new SqlCommand("select * from DeptMaster", con);
                DataSet ds = new DataSet();
                SqlDataAdapter da = new SqlDataAdapter(cmd1);
                SqlCommandBuilder cmb = new SqlCommandBuilder(da);
                da.Fill(ds, "deptmaster");
                gvUsers.DataSource = ds.Tables["deptmaster"];
                gvUsers.DataBind();
            }
            else
            {
                SqlCommand cmd1 = new SqlCommand("select * from OfficeMaster where Office ='" + Session["Office"].ToString() + "'", con);
                DataSet ds = new DataSet();
                SqlDataAdapter da = new SqlDataAdapter(cmd1);
                SqlCommandBuilder cmb = new SqlCommandBuilder(da);
                da.Fill(ds, "deptmaster");
                gvUsers.DataSource = ds.Tables["deptmaster"];
                gvUsers.DataBind();
            }
            con.Close();
        }
    }

// WARNING
//
// This file has been generated automatically by MonoDevelop to store outlets and
// actions made in the Xcode designer. If it is removed, they will be lost.
// Manual changes to this file may not be handled correctly.
//
using MonoMac.Foundation;

namespace dontgivemeerrors
{
	[Register ("MainWindowController")]
	partial class MainWindowController
	{
		[Outlet]
		MonoMac.AppKit.NSTextField guiTextField { get; set; }

		[Outlet]
		MonoMac.AppKit.NSButton guiButton { get; set; }

		[Action ("buttonClicked:")]
		partial void buttonClicked (MonoMac.Foundation.NSObject sender);
		
		void ReleaseDesignerOutlets ()
		{
			if (guiTextField != null) {
				guiTextField.Dispose ();
				guiTextField = null;
			}

			if (guiButton != null) {
				guiButton.Dispose ();
				guiButton = null;
			}
		}
	}

	[Register ("MainWindow")]
	partial class MainWindow
	{
		
		void ReleaseDesignerOutlets ()
		{
		}
	}
}

partial void buttonClicked (MonoMac.Foundation.NSObject sender)
{

}

partial void buttonClicked (MonoMac.Foundation.NSObject sender)
{
     this.guiLabel.StringValue = "Hello World";
}