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 <asp:GridView ID="gvOrderSetWithEscrow" runat="server" 
                      <Columns>
                <asp:boundfield DataField="UserName" HeaderText="用户名" ReadOnly="True">
                </asp:boundfield>
  <asp:templateField HeaderText="操作" >
                    <ItemTemplate>
                        <asp:Button ID="btnPayAmount" runat="server" Text="确定" CommandName="Ok" />
                    </ItemTemplate>
               </asp:TemplateField>
            </Columns>
        </asp:GridView>

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  protected void gvOrderSetWithEscrow_RowCommand(object sender, GridViewCommandEventArgs e)
        {                   
            if (e.CommandName == "Ok")
            {  Control cmdControl = e.CommandSource as Control;  
                GridViewRow row = cmdControl.NamingContainer as GridViewRow;
                int rowindex = row.RowIndex;
                if (row.RowType == DataControlRowType.DataRow)
                {  string username = gvOrderSetWithEscrow.Rows[rowindex].Cells[0].Text.ToString();//这里，我不想通过 0 来取值，而是通过绑定的列名[username]来取值，应该怎么取