how to search in gridview values using textbox in visual studio 2010 like google search, ex:if i enter one letter it automatically search values according to that letter

Question

 hi friends,  
               i am developing the asp.net project using c# in visual studio 2010..i am very confused to searching gridview values through textbox like google search..if i search a letter it automatically search a value according to this letter. pls help me friends...