如何判断文本框控件是否存在

[lizhengqin]

前端代码如下:<input id='b1' ReadOnly='true' value='0' style='width:80px;' runat="server" />

我在后台如何判断是否存在 id='b1' 的input?

[北极小猪]

遍历页面，标签是input的。。。

[北极小猪]

或者form1.FindControl(“id”)看看是不是空

[IT-Style]

        Dim bool As Boolean = False
        For Each item In Me.Controls
            If item.GetType.ToString = "System.Web.UI.HtmlControls.HtmlInputText" Then
                Dim control = TryCast(item, System.Web.UI.HtmlControls.HtmlInputText)
                If control.ID = "b1" Then
                    bool = True
                    Exit For
                End If
            End If
         Next

[lizhengqin]

HtmlInputControl hi = ((HtmlInputControl)form1.FindControl("Text1"));
if (hi != null)
{
hi.Value = "aaaaaaaaaaaaaaaa";
}