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protected void ImageButton3_Click(object sender, ImageClickEventArgs e)
    {
        conn.Open();

        SqlCommand cmd = new SqlCommand("SELECT * from User_Info WHERE UserName=@un AND Password=@psd", conn);
        cmd.Parameters.AddWithValue("@un", this.TextBox_UserName.Text);
        cmd.Parameters.AddWithValue("@psd", this.TextBox_psd.Text);
        SqlDataReader sdr = cmd.ExecuteReader();
        if (sdr.HasRows==true)
        {
            try
            {
             
                sdr.Read();
                Session["UserID"] = sdr["UserID"];
                Session["NickName"] = sdr["NickName"];
                Session["Type"] = sdr["Type"];
                Session["Login"] = true;
 


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