求帮助

直接调试出现的问题

逐步调试出现的问题

这行代码，我同学用的没问题，我自己做就运行错误咯using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Data.OleDb;


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


}
protected void Button2_Click(object sender, EventArgs e)
{
Response.Redirect("login-movie.aspx");
}
protected void Button1_Click(object sender, EventArgs e)
{
string str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("cinema.mdb");
OleDbConnection con = new OleDbConnection(str);
con.Open();
OleDbCommand comm = new OleDbCommand("select * from yonghu where Id = '" + TextBox1.Text + " '", con);
OleDbDataReader c = comm.ExecuteReader();
if (!c.Read())
{


Label5.Visible = true;
Label5.Text = "没有此用户!";
c.Close();




return;
}






OleDbCommand com = new OleDbCommand("select Password from yonghu where Id = '" + TextBox1.Text + " '", con);


String ha = com.ExecuteScalar().ToString();




if (TextBox2.Text != ha)
{
//Label6.Visible = true;
Label5.Text = "用户名与初始密码不相符！";
}
if (TextBox2.Text == ha)
{
//Label6.Visible = false;
OleDbCommand comn = new OleDbCommand("update yonghu set Password = '" + TextBox4.Text + "' where Id = '" + TextBox1.Text + " '", con);
comn.CommandText = "update yonghu set Password = '" + TextBox4.Text + "' where Id = '" + TextBox1.Text + " '";



comn.Connection = con;
comn.ExecuteNonQuery();


con.Close();
Label7.Visible = true;


}
}
}
一旦运行就会出错，如图所示

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