default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (Convert.ToInt32(TextBox2.Text.Trim()) > TextBox1.Text.Length)
        {
            Page.RegisterStartupScript("", "<script>alert('位置错误')</script>");
        }
        else
        {
            string Bstr = TextBox1.Text.ToString().Trim();
            int i = Convert.ToInt32(TextBox2.Text.Trim().ToString());
            string InStr = TextBox3.Text.ToString().Trim();
            string NewStr = Bstr.Insert(i, InStr);
            TextBox4.Text = NewStr;
        }
    }
}