頁面控件沒有在當前的背景下

在我的設計部分，我添加了所有的標籤和下拉列表，但register.aspx.cs，它顯示了這些控件不會在當前的背景下存在的存在..頁面控件沒有在當前的背景下

using System;  
    using System.Collections;  
    using System.Configuration;  
    using System.Data;  
    using System.Linq;  
    using System.Web;  
    using System.Web.Security;  
    using System.Web.UI;  
    using System.Web.UI.HtmlControls;  
    using System.Web.UI.WebControls;  
    using System.Web.UI.WebControls.WebParts;  
    using System.Xml.Linq;  
    using System.Data.SqlClient; 
    using System.IO; 


    public partial class register : System.Web.UI.Page  
    {  
    SqlConnection con = new SqlConnection("server = .\\SQLEXPRESS;AttachDbFileName =|DataDirectory|\\Database123.mdf;trusted_connection = true;USER Instance =yes");  
    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 



    protected void Button2_Click(object sender, EventArgs e) 
    { 


     try 
     { 

      if (CheckBox1.Checked == true) 
      { 
       String f; 
       f = Path.GetFileName(FileUpload1.FileName); 
       con.Open(); 
       if (f != "") 
       { 

        FileUpload1.SaveAs(Server.MapPath("~") + "/images/" + f); 
        Label2.Text = "~" + "/images/" + f; 

        SqlCommand cmd1 = new SqlCommand("insert into register values('" + TextBox1.Text + "','" + TextBox8.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + RadioButtonList1.SelectedValue + "','" + TextBox4.Text + "','" + DropDownList3.SelectedItem + "','" + DropDownList2.SelectedItem + "','" + TextBox7.Text + "','" + TextBox10.Text + "','" + RadioButtonList2.SelectedValue + "','" + TextBox12.Text + "','" + Label2.Text + "','" + DropDownList1.Text + "','" + TextBox14.Text + "')", con); 
        cmd1.ExecuteNonQuery(); 
        TextBox1.Text = " "; 
        TextBox8.Text = " "; 
        TextBox2.Text = " "; 
        TextBox3.Text = " "; 
        TextBox4.Text = " "; 
        // TextBox15.Text = " "; 
        // TextBox16.Text = " "; 
        TextBox7.Text = " "; 
        TextBox10.Text = " "; 
        TextBox12.Text = " "; 
        TextBox14.Text = " "; 

        Label1.Visible = true; 
        Label1.Text = "submitted successfully"; 
       } 

       else 
       { 

        SqlCommand cmd1 = new SqlCommand("insert into register(user_id,password,fname,lname,user_type,address,city,state,pin,contact_no,gender,email,seq_que,seq_ans) values('" + TextBox1.Text + "','" + TextBox8.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + RadioButtonList1.SelectedValue + "','" + TextBox4.Text + "','" + DropDownList3.SelectedItem + "','" + DropDownList2.SelectedItem + "','" + TextBox7.Text + "','" + TextBox10.Text + "','" + RadioButtonList2.SelectedValue + "','" + TextBox12.Text + "','" + DropDownList1.Text + "','" + TextBox14.Text + "')", con); 
        cmd1.ExecuteNonQuery(); 
        TextBox1.Text = " "; 
        TextBox8.Text = " "; 
        TextBox2.Text = " "; 
        TextBox3.Text = " "; 
        TextBox4.Text = " "; 
        // TextBox15.Text = " "; 
        //TextBox16.Text = " "; 
        TextBox7.Text = " "; 
        TextBox10.Text = " "; 
        TextBox12.Text = " "; 
        TextBox14.Text = " "; 

        Label1.Visible = true; 
        Label1.Text = "submitted successfully"; 
       } 
       con.Close(); 

      } 
      else 
      { 
       Label1.Visible = true; 
       Label1.Text = " terms & condition must checked"; 
      } 
     } 
     catch (Exception e1) 
     { 
      Response.Write("<script language='javascript'>alert(\"Invalid Data Entry\")</script>"); 
     } 

     } 
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e) 
    { 

    if (DropDownList2.SelectedIndex == 1) 
     { 
      DropDownList3.Items.Clear(); 
      DropDownList3.Items.Add("jaipur"); 
      DropDownList3.Items.Add("udaipur"); 
      DropDownList3.Items.Add("ajmer"); 
      DropDownList3.Items.Add("bharatpur"); 
      DropDownList3.Items.Add("tonk"); 
     } 
     else if (DropDownList2.SelectedIndex == 2) 
     { 
      DropDownList3.Items.Clear(); 
      DropDownList3.Items.Add("amravati"); 
      DropDownList3.Items.Add("mumbai"); 

     } 
    } 

    protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e) 
    { 

    } 

    protected void CheckBox1_CheckedChanged(object sender, EventArgs e) 
    { 

    } 
    }

來源

2012-06-19 user949914

請提供aspx文件，並刪除除1個文本框以外的所有代碼，以便更容易地進行幫助和調試。 – CodingBarfield

如果你已經正確指定了page指令中的文件後面的代碼，並且仍然面對着sa我的問題，可能是你的頁面設計師（register.aspx.designer.cs）搞砸了。您可以刪除並重新創建它。

1）首先刪除register.aspx.designer.cs

2）然後右擊從Solution Explorer Web項目，並選擇選項Convert to Web Application（這將重新創建desginer.cs;現在它應該工作的罰款）

來源

2012-06-19 07:14:14

謝謝prashanth ..現在它正在工作。 – user949914

@ user949914很好。供參考：如果它回答你的問題，你可以將其標記爲答案。 –

確保您的Aspx頁面正確設置了CodeFile和Inherits屬性。

.aspx的：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Register.aspx.cs" Inherits="register" %>

代碼隱藏：

public partial class register : System.Web.UI.Page {}

來源

2012-06-19 06:57:25 Aphelion

入住遠日點的回答中提到的aspx頁面在繼承財產並確保標籤的aspx頁面上正確關閉

來源

2012-06-19 07:00:57

不錯....... –

如果您從不同版本的vs複製元素並將其粘貼到您的應用程序，則可能會遇到此問題。只需刪除這些元素並使用工具箱將它們添加回

來源

2013-10-14 11:47:02

頁面控件沒有在當前的背景下

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