我該如何解決該錯誤？

Question

在C＃中使用實體框架，出現以下錯誤：

條目“ AlMizanEntities”已被添加。 （D：\\ Document \\ Almizan \\ AlMizan \\ C＃\\ AlMizan \\ bin \\ Debug \\ AlMizan.vshost.exe.config第7行）

我的代碼：

private void Fraz()
{
    label1.Text = "Fraz ...";
    Application.DoEvents();

    AlMizanEntities1 ObjAE = new AlMizanEntities1();
}

public partial class AlMizanEntities1 : ObjectContext
{
   /// <summary>
   /// Initializes a new AlMizanEntities1 object using the connection string found in the 'AlMizanEntities1' section of the application configuration file.
   /// </summary>
   // *ERROR* occurs here
   public AlMizanEntities1() : base("name=AlMizanEntities1", "AlMizanEntities1")
   {
      this.ContextOptions.LazyLoadingEnabled = true;
      OnContextCreated();
   }

   /// <summary>
   /// Initialize a new AlMizanEntities1 object.
   /// </summary>
   public AlMizanEntities1(string connectionString) : base(connectionString, "AlMizanEntities1")
   {
        this.ContextOptions.LazyLoadingEnabled = true;
        OnContextCreated();
   }

   /// <summary>
   /// Initialize a new AlMizanEntities1 object.
   /// </summary>
   public AlMizanEntities1(EntityConnection connection) : base(connection, "AlMizanEntities1")
   {
        this.ContextOptions.LazyLoadingEnabled = true;
        OnContextCreated();
   }
}

Answer 1

取出line 7在D:\\Document\\Almizan\\AlMizan\\C#\\AlMizan\\App.config或刪除重復的行其他地方在該文件中。