Updatepanel + gridview with modal

Question

Hi friends I have show data in gridview.there is one link button when I have click this link button then I have show this particular record on the bootstrap modal. All code I have write in c# means (gridbind.aspx.cs) file. My question is when I click this link button then page is refresh I want to restrict to avoid refresh page whenever I have click link button. Please help me.