使页面挥发后保持焦点

<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" ontextchanged="TextBox1_TextChanged" TabIndex="1"></asp:TextBox>

<asp:TextBox ID="TextBox2" runat="server" AutoPostBack="True" ontextchanged="TextBox2_TextChanged" TabIndex="2"></asp:TextBox>

<asp:TextBox ID="TextBox3" runat="server" AutoPostBack="True" ontextchanged="TextBox3_TextChanged" TabIndex="3"></asp:TextBox>

然后，在事件中，将焦点存入Session:

 

protected void TextBox1_TextChanged(object sender, EventArgs e)
        {
            Session["event_controle"] = ((TextBox)sender);
        }
 
        protected void TextBox2_TextChanged(object sender, EventArgs e)
        {
            Session["event_controle"] = ((TextBox)sender);
        }
 
        protected void TextBox3_TextChanged(object sender, EventArgs e)
        {
            Session["event_controle"] = ((TextBox)sender);
        } 

最后，在页面生成时，载入焦点：

protected void Page_PreRender(object sender, EventArgs e)
        {
            try
            {
                if (Session["event_controle"] != null)
                { 
                    TextBox controle =(TextBox) Session["event_controle"];
 
                    controle.Focus(); 
                }
            }
            catch (InvalidCastException inEx)
            {
            }        
        }