C#

<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";
}

public partial class ComboEx : ComboBox
{
    internal ScrollbarEx vScrollBar;
    NativeListWindow listControl;
    public ComboEx()
    {
        InitializeComponent();
        DropDownHeight = 100;
        vScrollBar = new ScrollbarEx();
    }
 
    protected override void OnPaint(PaintEventArgs pe)
    {
        base.OnPaint(pe);
    }
 
    protected override void OnHandleCreated(EventArgs e)
    {
        base.OnHandleCreated(e);
        COMBOBOXINFO combInfo = new COMBOBOXINFO();
        combInfo.cbSize = Marshal.SizeOf(combInfo);
        Win32.GetComboBoxInfo( this.Handle, ref combInfo );
 
        listControl = new NativeListWindow(this, combInfo.hwndList);
    }
 
    protected override void WndProc(ref Message m)
    {
         if (m.Msg == (Win32.WM_REFLECT + Win32.WM_COMMAND))
        {
            if (Win32.HIWORD( (int)m.WParam ) == Win32.CBN_DROPDOWN)
            {
                COMBOBOXINFO combInfo = new COMBOBOXINFO();
                combInfo.cbSize = Marshal.SizeOf(combInfo);
                Win32.GetComboBoxInfo( this.Handle, ref combInfo );
 
                vScrollBar.Location = new Point( this.Width-23, 1 );
                vScrollBar.Size = new Size( 23, DropDownHeight );
                vScrollBar.Visible = true;
                Win32.SetParent(vScrollBar.Handle, combInfo.hwndList);
                Win32.ShowWindow(vScrollBar.Handle, ShowWindowCommands.Show);
                Win32.SetWindowPos(vScrollBar.Handle,HWND.TopMost, 155, 1, 23, 105, SetWindowPosFlags.SWP_SHOWWINDOW);
            }
        }
        base.WndProc(ref m);
    }
 
    // MyNativeWindow class to create a window given a class name.
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    internal class NativeListWindow : NativeWindow
    {
        // Constant values were found in the "windows.h" header file.
        private const int WS_CHILD = 0x40000000,
                          WS_VISIBLE = 0x10000000,
                          WM_ACTIVATEAPP = 0x001C;
 
        private int windowHandle;
 
        private ComboEx parent;
 
        public NativeListWindow(ComboEx owner,IntPtr handle)
        {
            AssignHandle(handle);
            parent = owner;
 
        }
 
        // Listen to when the handle changes to keep the variable in sync
        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
        protected override void OnHandleChange()
        {
            windowHandle = (int)this.Handle;
        }
 
        private void AdjustClientRect(ref RECT rect)
        {
            rect.right -= 23;
        }
 
        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
        protected override void WndProc(ref Message message)
        {
            // Listen for messages that are sent to the button window. Some messages are sent 
            // to the parent window instead of the button's window. 

            switch (message.Msg)
            {
                case Win32.NCCALCSIZE:
                    {
                        if (message.WParam != IntPtr.Zero)
                        {
                            NCCALCSIZE_PARAMS rcsize = (NCCALCSIZE_PARAMS)Marshal.PtrToStructure(message.LParam, typeof(NCCALCSIZE_PARAMS));
                            AdjustClientRect(ref rcsize.rect0);
                            Marshal.StructureToPtr(rcsize, message.LParam, false);
                        }
                        else
                        {
                            RECT rcsize = (RECT)Marshal.PtrToStructure(message.LParam, typeof(RECT));
                            AdjustClientRect(ref rcsize);
                            Marshal.StructureToPtr(rcsize, message.LParam, false);
                        }
                        message.Result = new IntPtr(1);
                        return;
                        break;
                    }
 
                    case Win32.WM_NCMOUSEMOVE:
                    {
                        base.WndProc(ref message);
                        Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                        break;
                        break;
                    }
                    case Win32.WM_NCLBUTTONDOWN:
                    {
                        base.WndProc(ref message);
                        Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                        break;
                    }
                    case Win32.WM_NCACTIVATE:
                    {
                        base.WndProc(ref message);
                        Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                        break;
                    }
                    case Win32.WM_NCMOUSELEAVE:
                    {
                        base.WndProc(ref message);
                        Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                        break;
                    }
                    case Win32.WM_NCLBUTTONUP:
                    {
                        base.WndProc(ref message);
                        Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                        break;
                    }
                    case Win32.WM_NCHITTEST:
                    {
                        base.WndProc(ref message);
                        Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                        break;
                    }
                    case Win32.WM_MOUSEMOVE:
                    {
                        base.WndProc(ref message);
                        if ((int)message.LParam > 0)
                        {
                            int x = Win32.LOWORD((int)message.LParam);
                            int y = Win32.HIWORD((int)message.LParam);
                            RECT rect = new RECT(); ;
                            Win32.GetWindowRect(new HandleRef(parent.vScrollBar, parent.vScrollBar.Handle),out rect);
                            Rectangle rc = new Rectangle(parent.vScrollBar.Location.X, parent.vScrollBar.Location.Y,
                                (rect.right - rect.left), (rect.bottom - rect.top));
                            if (rc.Contains(new Point(x, y)))
                            {
                                Win32.SetFocus(parent.vScrollBar.Handle);
                                Win32.SetWindowPos(parent.vScrollBar.Handle, HWND.TopMost, 155, 1, 23, 105, SetWindowPosFlags.SWP_SHOWWINDOW);
                                Win32.SendMessage(parent.vScrollBar.Handle, (uint)message.Msg, message.WParam, message.LParam);
                            }
                        }
                        break;
                    }
            }
            base.WndProc(ref message);
        }
    }
}

if (e.KeyCode == Keys.Enter && (sender as TextEdit).Text.Trim() != "")
{
    this.Cursor = Cursors.WaitCursor;
 
    is_form_exists = false;
 
    foreach (Form search_resul_form in this.MdiChildren)
    {
        frmSearchResult search_form = search_resul_form as frmSearchResult;
 
        if ((string)search_form.Tag == "BROWSE_PATIENTS")
        {
            // search_form.Activated(null, null);
            search_form.find_what = "FILE";
            search_form.find_text1 = (sender as TextEdit).Text.Trim();
            search_form.find_text2 = null;
            search_form.browse_result();
            search_form.Activate();
            is_form_exists = true;
            break;
        }
    }
 
    if (is_form_exists == false)
    {
        frmSearchResult SearchResultForm = new frmSearchResult(public_var);
        SearchResultForm.Tag = "BROWSE_PATIENTS";
        SearchResultForm.MdiParent = this;
        SearchResultForm.Dock = DockStyle.Fill;
        SearchResultForm.find_what = "FILE";
        SearchResultForm.find_text1 = (sender as TextEdit).Text.Trim();
        SearchResultForm.find_text2 = null;
        SearchResultForm.Show();
    }
 
    (sender as TextEdit).Text = "";
 
    this.Cursor = Cursors.Default;
}