Merkwürdige Situation mit System.Data.SqlClient.SqlException

Hallo ich versuche, eine Verbindung zu einer database mit C # zu knüpfen, aber hält mir das den Code:

SqlConnection connection = new SqlConnection("Data Source=FAVAI_LAB_01\\SQLSERVER;Initial Catalog=DBServicios;Integrated Security=True"); try { connection.Open(); SqlCommand myCommand = new SqlCommand("select ID_USUARIO from TUSUARIO" + "WHERE NOMBRE_USUARIO=@Param1 AND PASS=@Param2", connection); myCommand.Parameters.AddWithValue("@Param1", username); myCommand.Parameters.AddWithValue("@Param1", password); string CurrentName = (string)myCommand.ExecuteScalar(); if (CurrentName != null) { connection.Close(); Console.WriteLine("true"); } else { connection.Close(); Console.WriteLine("falsfgdge"); } } catch (System.Data.SqlClient.SqlException e) { Console.WriteLine(e.ToString()); } 

Dies ist der Fehler:

 System.Data.SqlClient.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) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser. Connect(serverInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustserverCert, Boolean integratedSecurity) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(serverInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(serverInfo serverInfo, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, TimeoutTimer timeout) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, TimeoutTimer timeout, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Webserver.Login.getAccess(String username, String password) in path\Login.cs:line 18 

Sie wählen ID_USUARIO, aber dann casting Sie es in String. Wahrscheinlich, wenn eine Spalte heißt ID_something der Typ von es ist nicht ein String-Typ.

Zwischen TUSUARIO und WHERE fehlt ein Platz

  SqlCommand myCommand = new SqlCommand("select ID_USUARIO from TUSUARIO " + "WHERE NOMBRE_USUARIO=@Param1 AND PASS=@Param2", connection);