VS 2010 - Delete Records In DataGridView (Checkbox)

I use this code to delete records in datagridview

Code:
// Iterate through the Products.Rows property
bool atLeastOneRowDeleted = false;
foreach (GridViewRow row in grdMessages.Rows)
{
if (((CheckBox)row.FindControl("chkMessage")).Checked == true)
{
atLeastOneRowDeleted = true;
}
}

But I encounter this message;

The varialbe 'atLeastOneRowDeleted' is assigned but its value is never used

and the 'atLeastOneRowDeleted' return False result even if i check a checkbox on the grid