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Web forms are session based and these sessions are automatically recycled by IIS every 20 minutes by default.  To eliminate losing your data, you should add the following code to your web forms code-behind's page consctructor method.

C#

Example

public partial class _Default : WorkflowPage
{
  public _Default() : base()
  {
    IsSimpleMode = true;
    IsSessionLess = true;
  }
}

VB.NET

Example

Public Class _Default
    Inherits WorkflowPage
   
    Public Sub New()
        MyBase.New
        IsSimpleMode = true
        IsSessionLess = true
    End Sub
End Class