How To Filter Data In The Datagridvie Using Linq

Question

There are a TexetBox and 2 ComboBoxes ? when i write in the TexeBox will Filter Data By Name and when chose from the ComboBoxes add filtering to previous filter

i upload the example here :
http://www.mediafire.com/download/y5cw3wv76bhx4mf/LINQ_Filter.zip[^]