Search data from a Gridview or Dataset.

Hello Guys,

I have a datagridview filled from a dataset on the form load, now I want to search specific data from the gridview using a textbox.
I don't want to go back to database again and fill the gridview.
I want to search from the existing dataset or Gridview,I guess this is a LINQ method.
Guys please help me with some advanced code.