如何在gridview中使特定字段更宽？

    <asp:BoundField DataField="ComputerModel" HeaderText="ComputerModel" 
    SortExpression="ComputerModel" 
    ItemStyle-Width="50px"/>

    <asp:CheckBoxField DataField="Lease" HeaderText="Lease" 
        SortExpression="Lease" />
    <asp:BoundField DataField="SerialNumber" HeaderText="SerialNumber" 
        SortExpression="SerialNumber" />
    <asp:BoundField DataField="LeasedTagNum" HeaderText="LeasedTagNum" 
        SortExpression="LeasedTagNum" />
    <asp:BoundField DataField="MonitorType" HeaderText="MonitorType" 
        SortExpression="MonitorType" />
    <asp:BoundField DataField="MonitorCount" HeaderText="MonitorCount" 
        SortExpression="MonitorCount" />
    <asp:CommandField ShowEditButton="True" ShowInsertButton="True" />
</Fields>
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#2461BF" />
<AlternatingRowStyle BackColor="White" />
    <asp:BoundField DataField="ComputerMode