Now, did you know that it’s very easy to have this page displayed during your own long-running operations? Not only that, it will redirect back to your code when it’s done with the execution.

Let’s say I have a UserControlWebpart in my SharePoint solution, and in my OnLoad method I call a couple of long-running operations and want the “Processing” page to show up. When completed, I want to come back to my page where the UserControlWebpart is. Here is all I need to wrap my custom long-running code with:

string comeBackUrl = this.ViewState["__REFERER__"].ToString();
 
using (SPLongOperation operation = new SPLongOperation(this.Page))
 
{
 
 operation.Begin();
 
 //….. your code here ….
 
 operation.End(comeBackUrl, Microsoft.SharePoint.Utilities.SPRedirectFlags.DoNotEncodeUrl, HttpContext.Current, null);
 
 }
 

That`s all that you need to do; SharePoint takes care of the rest.