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)
    {
        string AllStr = TextBox1.Text.Trim().ToString();
        string str = TextBox2.Text.Trim().ToString();
        int i = AllStr.IndexOf(str);
        Label1.Text = "该字符是字符串的第："+i+"位";
    }
}