hiding gridview column at the time of print

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C#

ASP.NET

Hi,

I want to hide the some columns of a grid view when i am printing the page by button click. I use the Code for that

GridView1.Columns[0].Visible = false;
       Session["ctrl"] = Panel1;
       ClientScript.RegisterStartupScript(this.GetType(), "onclick", "<script language=javascript>window.open('Print.aspx','PrintMe');</script>");