Checkboxes in ASP.Net Gridview

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C#

ASP.NET

Hi, What I want to do is to have a gridview on my asp.net page that has checkboxes in the first column and below the grid there is to be a button. Now I databind the grid to a table which contains only three attributes namely ID, Name and Email. Now what I want to do is that when the button is clicked files should be created in a folder by the names of the corresponding checked checkboxes.
Here is what I have so far, but what the code does is that even if a single checkbox is checked it will loop through the gridview and make some files. Here is the code:

foreach (GridViewRow row in GridView1.Rows)
           {
               // Access the CheckBox
               CheckBox cb = (CheckBox)row.FindControl("StatusUpdate");
               if (cb.Checked || cb != null)
               {
                   //int ID = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);
                   int index = row.RowIndex;
                   string name = GridView1.Rows[index].Cells[1].Text;
                   File.Create("D:\\"+name+".txt");
               }
               else
               {
               }
           }
           File.AppendAllText(@"E:\Try.text", "No box checked" + Environment.NewLine);