About c#.net dobts

Question

Hello Sir/Madam,

  This is Rajini,

    Iam doing one project in asp.net web Application in that i have one doubt.Am Adding One Textbox to the WebPage.In execution Am Adding some data to that Textbox.Next time am Executing Same project Am Adding Some Data To that Textbox.I want Previous Data Also in that textbox,Mean Every execution am adding some data to that textbox i want each and every transaction data in textbox....

Thanks&regards

Rajini