Converting session into string and storing in the session variable, will improve perfomence?

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session

string

ASP.NET4

Hi,

I am storing the huge dataset in the session variable. which is causing the performance of the application. As the dataset has the information which is specific to the user hence cannot store this huge data in cache object.
Now I am converting this dataset into xml and storing into the session as a string. While retrieving the data I am again converting that xml string into dataset.
will this move help me to improve the performance of the application?
What are other options to reduce the size of the user session and improve performance of the application.

What I have tried:

// Convert dataset to string and storing in the session
Session["UserData"] = Ds.GetXml().ToString();

// Convert string to dataset
   DataSet DS = new DataSet() ;
   stream = new StringReader(xmlData);
   reader = new XmlTextReader(stream);
   DS.ReadXml(reader);