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MultiView.ActiveViewIndex Property

Note: This property is new in the .NET Framework version 2.0.

Gets or sets the index of the active View control within a MultiView control.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

public virtual int ActiveViewIndex { get; set; }
/** @property */
public int get_ActiveViewIndex ()

/** @property */
public void set_ActiveViewIndex (int value)

public function get ActiveViewIndex () : int

public function set ActiveViewIndex (value : int)

Property Value

The zero-based index of the active View control within a MultiView control. The default is -1, indicating that no view is set as active.

Exception typeCondition

ArgumentOutOfRangeException

The specified index was set to less than -1, or greater than or equal to the number of items on the list.

Use the ActiveViewIndex property to set a View control within a MultiView control as the active view. You can also use this property to return the index of the View control that is currently set as the active view. The index of a View control is determined by the order in which it is declared within a MultiView control. For example, the first View control declared within a MultiView control has an index of 0.

Only one View control at a time can be defined as active within a MultiView control. The View control that is set to the ActiveViewIndex property will be rendered to the client. If the ActiveViewIndex property is set to a View that does not exist within the MultiView control, a ArgumentOutOfRangeException is raised at run time. If the property is empty, the MultiView control does not render any content to the client.

You can set the ActiveViewIndex property either declaratively at development time or programmatically at run time. Setting the ActiveViewIndex property declaratively when you define the MultiView control causes the View control that is set as the active view to render to the client the first time the MultiView control is called. Setting the ActiveViewIndex property programmatically allows the application to determine which View control to render to the client at run time based on criteria such as a user's identity or their preferences.

Alternately, you can use the SetActiveView and GetActiveView methods to set or get the active view within the MultiView control.

TopicLocation
How to: Add MultiView Web Server Controls to a Web Forms Page (Visual Studio)Building ASP .NET Web Applications in Visual Studio

The following code example demonstrates how to use a MultiView control to create a basic survey. Each View control is a separate survey question. When the user clicks the Previous button on any page, the ActiveViewIndex property is decremented to navigate to the previous View control. When the user clicks the Next button on any page, the ActiveViewIndex property is incremented to navigate to the next View control.

NoteNote

The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model.

<%@ Page Language="C#" %>

<html>
<head>
  <script runat="server">

  protected void NextButton_Command(object sender, EventArgs e)
  {
    // Determine which button was clicked
    // and set the ActiveViewIndex property to
    // the view selected by the user.
    if (DevPollMultiView.ActiveViewIndex > -1 & DevPollMultiView.ActiveViewIndex < 3)
    {
      // Increment the ActiveViewIndex property 
      // by one to advance to the next view.
      DevPollMultiView.ActiveViewIndex += 1;
    }
    else if (DevPollMultiView.ActiveViewIndex == 3)
    {
      // This is the final view.
      // The user wants to save the survey results.
      // Insert code here to save survey results.
      // Disable the navigation buttons.
      Page4Save.Enabled = false;
      Page4Restart.Enabled = false;
    }
    else
    {
      throw new Exception("An error occurred.");
    }
  }

  protected void BackButton_Command(object sender, EventArgs e)
  {
    if (DevPollMultiView.ActiveViewIndex > 0 & DevPollMultiView.ActiveViewIndex <= 2)
    {
      // Decrement the ActiveViewIndex property
      // by one to return to the previous view.
      DevPollMultiView.ActiveViewIndex -= 1;
    }
    else if (DevPollMultiView.ActiveViewIndex == 3)
    {
      // This is the final view.
      // The user wants to restart the survey.
      // Return to the first view.
      DevPollMultiView.ActiveViewIndex = 0;
    }
    else
    {
      throw new Exception("An error occurred.");
    }
  }

  </script>

</head>
<body>
    <form ID="Form1" runat="Server">
        
        <h3>MultiView ActiveViewIndex Example</h3>
        
        <asp:Panel id="Page1ViewPanel" 
            Width="330px" 
            Height="150px"
            HorizontalAlign =Left
            Font-size="12" 
            BackColor="#C0C0FF" 
            BorderColor="#404040"
            BorderStyle="Double"                     
            runat="Server">  

            <asp:MultiView id="DevPollMultiView"
                ActiveViewIndex=0
                runat="Server">

                <asp:View id="Page1" 
                    runat="Server">   

                    <asp:Label id="Page1Label" 
                        Font-bold="true"                         
                        Text="What kind of applications do you develop?"
                        runat="Server">
                    </asp:Label><br><br>

                    <asp:RadioButton id="Page1Radio1"
                         Text="Web Applications" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="server" >
                    </asp:RadioButton><br>

                    <asp:RadioButton id="Page1Radio2"
                         Text="Windows Forms Applications" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="server" >
                     </asp:RadioButton><br><br><br>                                       
                     
                    <asp:Button id="Page1Next"
                        Text = "Next"
                        OnClick="NextButton_Command"
                        Height="25"
                        Width="70"
                        runat= "Server">
                    </asp:Button>     
                          
                </asp:View>

                <asp:View id="Page2" 
                    runat="Server">

                    <asp:Label id="Page2Label" 
                        Font-bold="true"                        
                        Text="How long have you been a developer?"
                        runat="Server">                    
                    </asp:Label><br><br>

                    <asp:RadioButton id="Page2Radio1"
                         Text="Less than five years" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="Server">
                     </asp:RadioButton><br>

                    <asp:RadioButton id="Page2Radio2"
                         Text="More than five years" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="Server">
                     </asp:RadioButton><br><br><br>

                    <asp:Button id="Page2Back"
                        Text = "Previous"
                        OnClick="BackButton_Command"
                        Height="25"
                        Width="70"
                        runat= "Server">
                    </asp:Button> 

                    <asp:Button id="Page2Next"
                        Text = "Next"
                        OnClick="NextButton_Command"
                        Height="25"
                        Width="70"
                        runat="Server">
                    </asp:Button> 
                
                </asp:View>

                <asp:View id="Page3" 
                    runat="Server">

                    <asp:Label id="Page3Label1" 
                        Font-bold="true"                        
                        Text= "What is your primary programming language?"                        
                        runat="Server">                    
                    </asp:Label><br><br>

                    <asp:RadioButton id="Page3Radio1"
                         Text="Visual Basic .NET" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="Server">
                     </asp:RadioButton><br>

                    <asp:RadioButton id="Page3Radio2"
                         Text="C#" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="Server">
                     </asp:RadioButton><br>

                    <asp:RadioButton id="Page3Radio3"
                         Text="C++" 
                         Checked="False" 
                         GroupName="RadioGroup1" 
                         runat="Server">
                     </asp:RadioButton><br><br>

                     <asp:Button id="Page3Back"
                        Text = "Previous"
                        OnClick="BackButton_Command"
                        Height="25"
                        Width="70"
                        runat="Server">
                    </asp:Button> 

                    <asp:Button id="Page3Next"
                        Text = "Next"
                        OnClick="NextButton_Command"
                        Height="25"
                        Width="70"
                        runat="Server">
                    </asp:Button><br>
                    
                </asp:View>     
            
                <asp:View id="Page4"
                    runat="Server">
                    
                    <asp:Label id="Label1"
                        Font-bold="true"                                           
                        Text = "Thank you for taking the survey."
                        runat="Server">
                    </asp:Label>
                    
                    <br><br><br><br><br><br>              
                   
                    <asp:Button id="Page4Save"
                        Text = "Save Responses"
                        OnClick="NextButton_Command"
                        Height="25"
                        Width="110"
                        runat="Server">
                    </asp:Button>
                
                    <asp:Button id="Page4Restart"
                        Text = "Retake Survey"
                        OnClick="BackButton_Command"
                        Height="25"
                        Width="110"
                        runat= "Server">
                    </asp:Button>                    
                    
                </asp:View>  
       
            </asp:MultiView>
        
        </asp:Panel> 

    </form>
</body>
</html>

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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