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Accessing View State of one page on other ASP.Net Page


There was one question always occurs, can we access viewstate one page to other page? And answer is Yes, 

“Is it possible to access the ViewState variable of one page on another page?”

We can access the viewstate variables across pages. This is only possible if Cross Page Posting or Server.transfer is used to redirect the user to other page. If Response.redirect is used, then ViewState cannot be accessed across pages.

Here I have two pages Default.aspx and Default2.aspx.I have one Textbox and button control in first page (Default.aspx), after submit button it will be redirect to other page (Default2.aspx) were u get first page viewstate

Default.aspx


 <html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form2" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"> </asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" Style="height: 26px" />
    </div>
    </form>
</body>
</html>

Code Behind
protected void Page_Load(object sender, EventArgs e)
{
}
public StateBag ReturnViewState()
{
    return ViewState;
}
protected void Button1_Click(object sender, EventArgs e)
{
    ViewState["test"] = TextBox1.Text.ToString();
    Server.Transfer("Default2.aspx");
}

Defualt2.aspx
protected void Page_Load(object sender, EventArgs e)
{
    StateBag objStateBag = null;
    if (PreviousPage != null)
    {
        Object objPreviousPage = (Object)PreviousPage;
        System.Reflection.MethodInfo objMethod = objPreviousPage.GetType().GetMethod("ReturnViewState");
        objStateBag = (StateBag)objMethod.Invoke(objPreviousPage, null);
    }
    Response.Write("First Page Textbox value : " + objStateBag["test"].ToString());
}
Suppose we entered “Viewstate testing” in first page text box, 

Output

First Page Textbox value : Viewstate testing
Download code here

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Comments

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