Imports System
Imports System.Web
Imports System.Drawing
Imports System.Web.UI.WebControls
Imports System.Web.UI.Design.WebControls
Imports System.Collections
Imports System.ComponentModel
Imports System.Security.Permissions

Namespace Examples.VB.WebControls.Design

    ' The MyFormView is a copy of the FormView.
    <AspNetHostingPermission(SecurityAction.Demand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    <Designer(GetType(Examples.VB.WebControls.Design.MyFormViewDesigner))> _
    Public Class MyFormView
        Inherits FormView
    End Class ' MyFormView

    ' Override members of the FormViewDesigner.
    Public Class MyFormViewDesigner
        Inherits FormViewDesigner

        ' Determines the number of design-time links in the pager row.
        Protected Overrides ReadOnly Property SampleRowCount() As Integer
            Get
                ' Render four links in the pager row.
                Return 4
            End Get
        End Property ' SampleRowCount

        ' Generate the design-time markup.
        Private Const capTag As String = "caption"
        Private Const trOpen As String = "tr><td colspan=9 align=center"
        Private Const trClose As String = "td></tr"

        Public Overrides Function GetDesignTimeHtml() As String

            ' Make the full extent of the control more visible in the designer.
            ' If the border style is None or NotSet, change the border to
            ' a wide, blue, dashed line. Include the caption within the border.
            Dim myGV As MyFormView = CType(Component, MyFormView)
            Dim markup As String = Nothing
            Dim charX As Integer

            ' Check if the border style should be changed.
            If (myGV.BorderStyle = BorderStyle.NotSet Or _
                myGV.BorderStyle = BorderStyle.None) Then

                Dim oldBorderStyle As BorderStyle = myGV.BorderStyle
                Dim oldBorderWidth As Unit = myGV.BorderWidth
                Dim oldBorderColor As Color = myGV.BorderColor

                ' Set the design-time properties and catch any exceptions.
                Try
                    myGV.BorderStyle = BorderStyle.Dashed
                    myGV.BorderWidth = Unit.Pixel(3)
                    myGV.BorderColor = Color.Blue

                    ' Call the base method to generate the markup.
                    markup = MyBase.GetDesignTimeHtml()

                Catch ex As Exception
                    markup = GetErrorDesignTimeHtml(ex)

                Finally
                    ' Restore the properties to their original settings.
                    myGV.BorderStyle = oldBorderStyle
                    myGV.BorderWidth = oldBorderWidth
                    myGV.BorderColor = oldBorderColor
                End Try

            Else
                ' Call the base method to generate the markup.
                markup = MyBase.GetDesignTimeHtml()
            End If

            ' Look for a <caption> tag.
            charX = markup.IndexOf(capTag)
            If charX > 0 Then

                ' Replace the first caption with 
                ' "tr><td colspan=9 align=center".
                ' It is okay if the colspan exceeds the 
                ' number of columns in the table.
                markup = markup.Remove(charX, _
                    capTag.Length).Insert(charX, trOpen)

                ' Replace the second caption with "td></tr".
                charX = markup.IndexOf(capTag, charX)
                If charX > 0 Then
                    markup = markup.Remove(charX, _
                        capTag.Length).Insert(charX, trClose)
                End If
            End If

            Return markup

        End Function ' GetDesignTimeHtml
    End Class ' MyFormViewDesigner
End Namespace ' Examples.VB.WebControls.Design

using System;
using System.Web;
using System.Drawing;
using System.Web.UI.WebControls;
using System.Web.UI.Design.WebControls;
using System.Collections;
using System.ComponentModel;
using System.Security.Permissions;

namespace Examples.CS.WebControls.Design
{
    // The MyFormView is a copy of the FormView.
    [AspNetHostingPermission(SecurityAction.Demand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [Designer(typeof(Examples.CS.WebControls.Design.MyFormViewDesigner))]
    public class MyFormView : FormView
    {
    } // MyFormView

    // Override members of the FormViewDesigner.
    public class MyFormViewDesigner : FormViewDesigner
    {
        // Determines the number of design-time links in the pager row.
        protected override int SampleRowCount
        {
            get
            {
                // Render four links in the pager row.
                return 4;
            }
        } // SampleRowCount

        // Generate the design-time markup.
        const string capTag = "caption";
        const string trOpen = "tr><td colspan=9 align=center";
        const string trClose = "td></tr";

        public override string GetDesignTimeHtml()
        {
            // Make the full extent of the control more visible in the designer.
            // If the border style is None or NotSet, change the border to
            // a wide, blue, dashed line. Include the caption within the border.
            MyFormView myGV = (MyFormView)Component;
            string markup = null;
            int charX;

            // Check if the border style should be changed.
            if (myGV.BorderStyle == BorderStyle.NotSet ||
                myGV.BorderStyle == BorderStyle.None)
            {
                BorderStyle oldBorderStyle = myGV.BorderStyle;
                Unit oldBorderWidth = myGV.BorderWidth;
                Color oldBorderColor = myGV.BorderColor;

                // Set the design-time properties and catch any exceptions.
                try
                {
                    myGV.BorderStyle = BorderStyle.Dashed;
                    myGV.BorderWidth = Unit.Pixel(3);
                    myGV.BorderColor = Color.Blue;

                    // Call the base method to generate the markup.
                    markup = base.GetDesignTimeHtml();
                }
                catch (Exception ex)
                {
                    markup = GetErrorDesignTimeHtml(ex);
                }
                finally
                {
                    // Restore the properties to their original settings.
                    myGV.BorderStyle = oldBorderStyle;
                    myGV.BorderWidth = oldBorderWidth;
                    myGV.BorderColor = oldBorderColor;
                }
            }
            else
                // Call the base method to generate the markup.
                markup = base.GetDesignTimeHtml();

            // Look for a <caption> tag.
            if ((charX = markup.IndexOf(capTag)) > 0)
            {
                // Replace the first caption with 
                // "tr><td colspan=9 align=center".
                // It is okay if the colspan exceeds the 
                // number of columns in the table.
                markup = markup.Remove(charX,
                    capTag.Length).Insert(charX, trOpen);

                // Replace the second caption with "td></tr".
                if ((charX = markup.IndexOf(capTag, charX)) > 0)
                    markup = markup.Remove(charX,
                        capTag.Length).Insert(charX, trClose);
            }
            return markup;

        } // GetDesignTimeHtml
    } // MyFormViewDesigner
} // Examples.CS.WebControls.Design