how to delete checked row in grideview using linkbutton and checkbox

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="EmployeeID" DataSourceID="SqlDataSource1">
   <Columns>
      <asp:TemplateField>
          <ItemTemplate>
            <asp:CheckBox ID="cbRows" runat="server"/>
          </ItemTemplate>
       </asp:TemplateField>
<asp:BoundField DataField="EmployeeID" HeaderText="EmployeeID" InsertVisible="False" ReadOnly="True" SortExpression="EmployeeID" />
<asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
   </Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" Runat="server"
SelectCommand="SELECT EmployeeID, LastName, City FROM Employees"
DeleteCommand="DELETE FROM Employees WHERE [EmployeeID] = @EmployeeID"
ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" >
   <DeleteParameters>
       <asp:Parameter Name="EmployeeID" />
   </DeleteParameters>
</asp:SqlDataSource>
<asp:Button
   ID="btnMultipleRowDelete"
   OnClick="btnMultipleRowDelete_Click"
   runat="server"
   Text="Delete Rows" />

protected void btnMultipleRowDelete_Click(object sender, EventArgs e)
{
        
        foreach (GridViewRow row in GridView1.Rows)
        {
            CheckBox checkbox = (CheckBox)row.FindControl("cbRows");
            
            if (checkbox.Checked)
            {
               int employeeID = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Value);

SqlDataSource1.DeleteParameters["EmployeeID"].DefaultValue = employeeID.ToString();
                SqlDataSource1.Delete();
            }
        }
 }