asp.net基础（一）

循环添加控件

<div id="div1"  runat="server">
    
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
&nbsp;<asp:Button ID="btn1" runat="server" OnClick="btn1_Click" style="margin-left: 39px" Text="创建文本框" />
        <asp:TextBox ID="TextBox2" runat="server" style="margin-left: 149px">123</asp:TextBox>
        <br />
        <asp:Panel ID="panel1" runat="server" Width="760px">
        </asp:Panel>
        <br />
        <asp:Button ID="Button1" runat="server" style="margin-left: 163px" Text="文本框的个数" OnClick="Button1_Click" />
    
    </div>

 protected void Page_Load(object sender, EventArgs e)
    {
        int i = 0;
        try
        {
            i = Int16.Parse(TextBox1.Text);
        }
        catch { }
        
        for (int o = 0; o < i; o++)
        {
            TextBox a = new TextBox();
            a.Text = o.ToString();
            panel1.Controls.Add(a);
        }
    }

    protected void btn1_Click(object sender, EventArgs e)
    {
        
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        int i = 0;
        foreach(Control a in div1.Controls) 
        {
            if(a is TextBox)
            {
                i++;
            }
        }
        Response.Write(i);
    }
}