title: How to set a check box in every row with one button click
body: <p>I have attempted to create event attached to a button to go through each row of the grid view to change the checked value to equal true. How make it so once I click this button it mark every thing to true?</p>
  
  <p>This is the code I have started with:</p>
  
  <pre><code>foreach (GridViewRow row in GridView1.Rows)
  { 
      //I get stuck at this part
      row.Cells[9].FindControl("Overwrite")
  }
  </code></pre>