Thursday, December 10, 2009

Transfer Data from one Page to another using ViewState with CrossPaging

Yes. We can transfer data from one page two another page
through View state.

yes we can do it by cross page posting (cross page
viewstate)

here is the code:

Source page code:
----------------
public partial class ViewStateContainer : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ViewState["Page1"] = "Page1 ViewState";
Server.Transfer("AccessViewState.aspx");
}

/*StateBag class: This class is the primary storage
mechanism for all HTML and Web server controls.
It stores attribute/value pairs as strings associated
with the control. It tracks changes to these
attributes only after the OnInit method is executed for
a page request, and saves the changes
to the page's or control's viewstate.*/
public StateBag ReturnViewState()
{
return ViewState;
}

}

Target page code:
----------------

public partial class AccessViewState : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (PreviousPage != null)
{
if (PreviousPageViewState != null)
{
Label1.Text = PreviousPageViewState["Page1"].ToString();
}
}
Response.Write(((Label)PreviousPage.FindControl("Label1")).Text);

}

private StateBag PreviousPageViewState
{
get
{
StateBag returnValue = null;
if (PreviousPage != null)
{
Object objPreviousPage = (Object)PreviousPage;
MethodInfo objMethod = objPreviousPage.GetType().GetMethod("ReturnViewState");
return (StateBag)objMethod.Invoke(objPreviousPage, null);
}
return returnValue;
}
}

}
courtesy:
http://www.allinterview.com/showanswers/36626.html

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