Serverfehler in der Anwendung /.

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Zeile 60: 	public SqlDataReader GetFolder(int UserID, int FolderID)
Zeile 61: 	{
Zeile 62: 		SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
Zeile 63: 		SqlCommand myCommand = new SqlCommand("SELECT * FROM Slideshow_Folder WHERE Trash=0 AND ParentID="+ FolderID +" AND UserID="+ UserID + " ORDER BY Sort DESC", myConnection);
Zeile 64: 	

[ArgumentException: Schlüsselwort wird nicht unterstützt: '.\\sqlexpress;database'.]
   System.Data.Common.DbConnectionOptions.ParseInternal(Hashtable parsetable, String connectionString, Boolean buildChain, Hashtable synonyms, Boolean firstKey) +4959556
   System.Data.Common.DbConnectionOptions..ctor(String connectionString, Hashtable synonyms, Boolean useOdbcRules) +98
   System.Data.SqlClient.SqlConnectionString..ctor(String connectionString) +64
   System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous) +24
   System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions) +200
   System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value) +62
   System.Data.SqlClient.SqlConnection.set_ConnectionString(String value) +4
   System.Data.SqlClient.SqlConnection..ctor(String connectionString) +24
   ASP.content_slideshow_ss_list_ascx.GetFolder(Int32 UserID, Int32 FolderID) in c:\inetpub\Kunden\michael-ruh.ch\content\slideshow\ss_list.ascx:62
   ASP.content_slideshow_ss_list_ascx.Page_Load(Object sender, EventArgs e) in c:\inetpub\Kunden\michael-ruh.ch\content\slideshow\ss_list.ascx:18
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Control.LoadRecursive() +141
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627