[Solved]How I Can Fill Column In Gridview With Some Default Text Or String Only When Column Is Null Or Empty

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ASP.NET

C#3.5

Gridview

m using GridView control in Asp.net

here in my database table m having some row empty or NULL,
GridView control is linked with SqlDataSource, When GridView is displayed on webpage
NULL column displays nothing it is empty.
how i can fill that column with some default text or string only when column is NULL or Empty ?