'/'应用程序.找不到网络名

我在ASP的Web应用程序工作。. NET Framework 4.5。项目已连接SQLSERVER数据库。一切都很顺利，我已经完成了这个项目。在发布项目之前，我将连接字符串更改为在线服务器数据库。网站发布成功。

为了对应用程序进行一些小的更改，我将连接字符串更改回本地数据库。现在，当我运行应用程序时，我得到以下错误:

'/'应用程序服务器错误。

无法找到网络名。

Description:当前web请求执行过程中发生未处理的异常。请查看堆栈跟踪以获得有关错误及其在代码中的起源位置的更多信息。

异常详细信息: System.ComponentModel。Win32Exception: network name cannot be found

源错误:

Line 49: 
Line 50:             DataTable dt = new DataTable();
Line 51:             conn.Open(); // Throws Exception Here
Line 52:             string query = "SELECT Event.StartDate, Event.title, Artist.[Stage Name] FROM Event INNER JOIN Artist ON Event.ArtistID=Artist.ID WHERE StartDate >= GETDATE() ORDER BY  CONVERT(DateTime, StartDate,101)  DESC";
Line 53:             SqlDataAdapter da = new SqlDataAdapter(query, conn);

源文件: c:'Users'Junaid'Desktop'FAST'PasoFino'Artist Management'ArtistManagementSystem'ArtistManagementSystem'Views'Portal'Dashboard.aspx.cs Line: 51

堆栈跟踪:

[Win32Exception (0x80004005): The network name cannot be found]
[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling) +821
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +332
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +38
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +699
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +89
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +426
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +191
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +154
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +21
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +90
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +217
   System.Data.SqlClient.SqlConnection.Open() +96
   ArtistManagementSystem.Views.Portal.Dashboard.showUpComingEvents() in c:'Users'Junaid'Desktop'FAST'PasoFino'Artist Management'ArtistManagementSystem'ArtistManagementSystem'Views'Portal'Dashboard.aspx.cs:51
   ArtistManagementSystem.Views.Portal.Dashboard.Page_Load(Object sender, EventArgs e) in c:'Users'Junaid'Desktop'FAST'PasoFino'Artist Management'ArtistManagementSystem'ArtistManagementSystem'Views'Portal'Dashboard.aspx.cs:20
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678

这是我的网站。配置:

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <system.web>
    <sessionState mode="InProc" timeout="20"></sessionState>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" maxRequestLength="1048576"/>
    <pages>
      <controls>
        <add assembly="TimePicker" namespace="MKB.TimePicker" tagPrefix="cc1"/>
        <add tagPrefix="ajaxtoolkit" namespace="AjaxControlToolkit" assembly="AjaxControlToolKit"/>
      </controls>
    </pages>
    <!--<authentication mode="Forms">
      <forms loginUrl="Views/Login/Login.aspx" defaultUrl="Views/Portal/Dashboard.aspx">
        <credentials passwordFormat="Clear">
          <user name="junaid" password="fastian123"/>
        </credentials>
      </forms>
    </authentication>
    <authorization>
      <deny users="?"/>
    </authorization>-->
  </system.web>
  <connectionStrings>
    <!--<add name="ArtistManagementSystemEntities" connectionString="metadata=res://*/Models.Model1.csdl|res://*/Models.Model1.ssdl|res://*/Models.Model1.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=REDDEVIL'SQLEXPRESS;initial catalog=ArtistManagementSystem;persist security info=True;user id=sa;password=fastian123;MultipleActiveResultSets=True;App=EntityFramework&quot;"
      providerName="System.Data.EntityClient" />
    <add name="ArtistManagementSystemConnectionString" connectionString="Data Source=REDDEVIL/SQLEXPRESS;Initial Catalog=ArtistManagementSystem;Persist Security Info=True;User ID=sa;Password=fastian123;MultipleActiveResultSets=True;Application Name=EntityFramework"
      providerName="System.Data.SqlClient" />-->
    <add name="ArtistManagementSystem" connectionString="Data Source=REDDEVIL/SQLEXPRESS;Initial Catalog=ArtistManagementSystem;User ID=sa;Password=***********" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>
  <appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
  </appSettings>
</configuration>

这就是我得到错误的地方:(Dashboard.aspx)

protected void showUpComingEvents()
    {
        //string myConnection = dbController.connectionString;
        string myConnection = dbController.connectionString;
        SqlConnection conn = new SqlConnection(myConnection);
        DataTable dt = new DataTable();
        conn.Open();
        string query = "SELECT Event.StartDate, Event.title, Artist.[Stage Name] FROM Event INNER JOIN Artist ON Event.ArtistID=Artist.ID WHERE StartDate >= GETDATE() ORDER BY  CONVERT(DateTime, StartDate,101)  DESC";
        SqlDataAdapter da = new SqlDataAdapter(query, conn);
        da.Fill(dt);
        conn.Close();
        if (dt.Rows.Count > 0)
        {
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }

这是dbController类，它只有一个连接字符串。(我知道这不是一个好方法，但这只是为了让事情工作)

dbController.cs:

public class dbController
{
    //public static string connectionString = "Data Source=SQL5027.myASP.NET;Initial Catalog=DB_A0C908_nbrewer0210;User Id=DB_A0C908_nbrewer0210_admin;Password=fastian123";
    public static string connectionString = "Data Source=REDDEVIL/SQLEXPRESS;Initial Catalog=ArtistManagementSystem;User ID=sa;Password=***********";
}

注意:我想提几件事:

1)我可以使用SqlServer Management Studio连接数据库。

2)在Services中，SQL Server (SQLEXPRESS)和SQL Server Browser正在运行

3)在SQL Server配置管理器，在客户端协议，TCP/IP &;