diff --git a/Modules.Database/BaseClass.vb b/Modules.Database/BaseClass.vb
deleted file mode 100644
index c5400025..00000000
--- a/Modules.Database/BaseClass.vb
+++ /dev/null
@@ -1,5 +0,0 @@
-Public MustInherit Class BaseClass
-    Public MustOverride Function GetDatatable(SqlCommand As String) As DataTable
-    Public MustOverride Function GetScalarValue(SqlCommand As String) As Object
-    Public MustOverride Function ExecuteNonQuery(SqlCommand As String) As Boolean
-End Class
diff --git a/Modules.Database/Database.vbproj b/Modules.Database/Database.vbproj
index d81dd7c2..4188cab7 100644
--- a/Modules.Database/Database.vbproj
+++ b/Modules.Database/Database.vbproj
@@ -90,7 +90,6 @@
     <Import Include="System.Threading.Tasks" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="BaseClass.vb" />
     <Compile Include="Constants.vb" />
     <Compile Include="Exceptions.vb" />
     <Compile Include="Firebird.vb" />
diff --git a/Modules.Database/Firebird.vb b/Modules.Database/Firebird.vb
index bac43c79..6eb0caf6 100644
--- a/Modules.Database/Firebird.vb
+++ b/Modules.Database/Firebird.vb
@@ -46,8 +46,6 @@ Imports DigitalData.Modules.Logging
 ''' REMARKS:        If the connection fails due to "wrong username or password", the cause might be that the server harddrive is full..
 ''' </summary>
 Public Class Firebird
-    Inherits BaseClass
-
     Private _Logger As Logger
     Private _LogConfig As LogConfig
     Private _connectionServer As String
@@ -221,7 +219,7 @@ Public Class Firebird
     ''' </summary>
     ''' <param name="SqlCommand">The command to execute</param>
     ''' <returns>True, if command was executed sucessfully. Otherwise false.</returns>
-    Public Overrides Function ExecuteNonQuery(SqlCommand As String) As Boolean
+    Public Function ExecuteNonQuery(SqlCommand As String) As Boolean
         Dim oConnection As FbConnection = GetConnection()
         Dim oScalarValue As Object = ExecuteNonQueryWithConnection(SqlCommand, oConnection)
         oConnection.Close()
@@ -268,7 +266,7 @@ Public Class Firebird
     ''' </summary>
     ''' <param name="SqlQuery">The query to execute</param>
     ''' <returns>The scalar value if the command was executed successfully. Nothing otherwise.</returns>
-    Public Overrides Function GetScalarValue(SqlQuery As String) As Object
+    Public Function GetScalarValue(SqlQuery As String) As Object
         Dim oConnection As FbConnection = GetConnection()
         Dim oScalarValue As Object = GetScalarValueWithConnection(SqlQuery, oConnection)
         oConnection.Close()
@@ -304,7 +302,8 @@ Public Class Firebird
 
             oAdapter.Fill(oDatatable)
         Catch ex As Exception
-            _Logger.Error(ex, $"Error in GetDatatableWithConnection while executing command: '{SqlQuery}'")
+            _Logger.Error(ex)
+            _Logger.Warn("Error in GetDatatableWithConnection while executing command: '{0}'", SqlQuery)
             Throw ex
         Finally
             MaybeCommitTransaction(oTransaction, TransactionMode)
@@ -318,11 +317,17 @@ Public Class Firebird
     ''' </summary>
     ''' <param name="SqlQuery">The query to execute</param>
     ''' <returns>A datatable containing the results if the command was executed successfully. Nothing otherwise.</returns>
-    Public Overrides Function GetDatatable(SqlQuery As String) As DataTable
-        Dim oConnection As FbConnection = GetConnection()
-        Dim oDatatable As DataTable = GetDatatableWithConnection(SqlQuery, oConnection)
-        oConnection.Close()
+    Public Function GetDatatable(SqlQuery As String, Optional TransactionMode As TransactionMode = TransactionMode.NoTransaction, Optional Transaction As FbTransaction = Nothing) As DataTable
+        Try
+            Dim oConnection As FbConnection = GetConnection()
+            Dim oDatatable As DataTable = GetDatatableWithConnection(SqlQuery, oConnection, TransactionMode, Transaction)
+            oConnection.Close()
 
-        Return oDatatable
+            Return oDatatable
+        Catch ex As Exception
+            _Logger.Error(ex)
+            _Logger.Warn("Error in GetDatatable while executing command: '{0}'", SqlQuery)
+            Throw ex
+        End Try
     End Function
 End Class
diff --git a/Modules.Database/MSSQLServer.vb b/Modules.Database/MSSQLServer.vb
index 7b92e2eb..e8c79674 100644
--- a/Modules.Database/MSSQLServer.vb
+++ b/Modules.Database/MSSQLServer.vb
@@ -2,13 +2,11 @@
 Imports DigitalData.Modules.Logging
 
 Public Class MSSQLServer
-    Inherits BaseClass
-
     Public DBInitialized As Boolean = False
     Public CurrentSQLConnectionString As String = ""
 
-    Private _Timeout As Integer
-    Private _Logger As Logger
+    Private ReadOnly _Timeout As Integer
+    Private ReadOnly _Logger As Logger
 
     Public Sub New(LogConfig As LogConfig, ConnectionString As String, Optional Timeout As Integer = 120)
         _Logger = LogConfig.GetLogger()
@@ -77,7 +75,7 @@ Public Class MSSQLServer
     ''' </summary>
     ''' <param name="SqlCommand">sqlcommand for datatable (select XYZ from TableORView)</param>
     ''' <returns>Returns a datatable</returns>
-    Public Overrides Function GetDatatable(SqlCommand As String) As DataTable
+    Public Function GetDatatable(SqlCommand As String, Timeout As Integer) As DataTable
         Try
             If TestCanConnect() = False Then
                 Return Nothing
@@ -86,7 +84,7 @@ Public Class MSSQLServer
             Using oConnection = GetSQLConnection()
                 Using oSQLCOmmand = oConnection.CreateCommand()
                     oSQLCOmmand.CommandText = SqlCommand
-                    oSQLCOmmand.CommandTimeout = _Timeout
+                    oSQLCOmmand.CommandTimeout = Timeout
 
                     Dim dt As DataTable = New DataTable()
                     Dim oAdapter As SqlDataAdapter = New SqlDataAdapter(oSQLCOmmand)
@@ -101,6 +99,10 @@ Public Class MSSQLServer
         End Try
     End Function
 
+    Public Function GetDatatable(SqlCommand As String) As DataTable
+        Return GetDatatable(SqlCommand, _Timeout)
+    End Function
+
     ''' <summary>
     ''' Executes the passed sql-statement 
     ''' </summary>
@@ -112,7 +114,7 @@ Public Class MSSQLServer
         Return ExecuteNonQuery(executeStatement)
     End Function
 
-    Public Overrides Function ExecuteNonQuery(SQLCommand As String) As Boolean
+    Public Function ExecuteNonQuery(SQLCommand As String, Timeout As Integer) As Boolean
         Try
             If TestCanConnect() = False Then
                 Return Nothing
@@ -121,7 +123,7 @@ Public Class MSSQLServer
             Using oConnection = GetSQLConnection()
                 Using oSQLCOmmand = oConnection.CreateCommand()
                     oSQLCOmmand.CommandText = SQLCommand
-                    oSQLCOmmand.CommandTimeout = _Timeout
+                    oSQLCOmmand.CommandTimeout = Timeout
                     oSQLCOmmand.ExecuteNonQuery()
                     Return True
                 End Using
@@ -133,6 +135,10 @@ Public Class MSSQLServer
         End Try
     End Function
 
+    Public Function ExecuteNonQuery(SQLCommand As String) As Boolean
+        Return ExecuteNonQuery(SQLCommand, _Timeout)
+    End Function
+
     ''' <summary>
     ''' Executes the passed sql-statement as Scalar
     ''' </summary>
@@ -143,7 +149,7 @@ Public Class MSSQLServer
         Return GetScalarValue(ScalarSQL)
     End Function
 
-    Public Overrides Function GetScalarValue(SQLQuery As String) As Object
+    Public Function GetScalarValue(SQLQuery As String, Timeout As Integer) As Object
         Try
             If TestCanConnect() = False Then
                 Return Nothing
@@ -152,7 +158,7 @@ Public Class MSSQLServer
             Using oConnection As SqlConnection = GetSQLConnection()
                 Using oSQLCOmmand = oConnection.CreateCommand()
                     oSQLCOmmand.CommandText = SQLQuery
-                    oSQLCOmmand.CommandTimeout = _Timeout
+                    oSQLCOmmand.CommandTimeout = Timeout
                     Dim oResult As Object = oSQLCOmmand.ExecuteScalar()
                     Return oResult
                 End Using
@@ -163,6 +169,10 @@ Public Class MSSQLServer
         End Try
     End Function
 
+    Public Function GetScalarValue(SQLQuery As String) As Object
+        Return GetScalarValue(SQLQuery, _Timeout)
+    End Function
+
     ''' <summary>
     ''' Executes the passed sql-statement in asyncmode
     ''' </summary>
diff --git a/Modules.Database/ODBC.vb b/Modules.Database/ODBC.vb
index 07f343e0..2d95c07d 100644
--- a/Modules.Database/ODBC.vb
+++ b/Modules.Database/ODBC.vb
@@ -2,8 +2,6 @@
 Imports DigitalData.Modules.Logging
 
 Public Class ODBC
-    Inherits BaseClass
-
     Private _Logger As Logger
     Private _LogConfig As LogConfig
 
@@ -88,7 +86,7 @@ Public Class ODBC
     ''' </summary>
     ''' <param name="SqlCommand">The command to execute</param>
     ''' <returns>True, if command was executed sucessfully. Otherwise false.</returns>
-    Public Overrides Function ExecuteNonQuery(SqlCommand As String) As Boolean
+    Public Function ExecuteNonQuery(SqlCommand As String) As Boolean
         Dim oConnection As OdbcConnection = GetConnection()
         Dim oScalarValue As Object = ExecuteNonQueryWithConnection(SqlCommand, oConnection)
         oConnection.Close()
@@ -128,7 +126,7 @@ Public Class ODBC
     ''' </summary>
     ''' <param name="SqlQuery">The query to execute</param>
     ''' <returns>A datatable containing the results if the command was executed successfully. Nothing otherwise.</returns>
-    Public Overrides Function GetScalarValue(SqlQuery As String) As Object
+    Public Function GetScalarValue(SqlQuery As String) As Object
         Dim oConnection As OdbcConnection = GetConnection()
         Dim oDatatable As DataTable = GetDatatableWithConnection(SqlQuery, oConnection)
         oConnection.Close()
@@ -171,7 +169,7 @@ Public Class ODBC
     ''' </summary>
     ''' <param name="SqlQuery">The query to execute</param>
     ''' <returns>A datatable containing the results if the command was executed successfully. Nothing otherwise.</returns>
-    Public Overrides Function GetDatatable(SqlQuery As String) As DataTable
+    Public Function GetDatatable(SqlQuery As String) As DataTable
         Dim oConnection As OdbcConnection = GetConnection()
         Dim oDatatable As DataTable = GetDatatableWithConnection(SqlQuery, oConnection)
         oConnection.Close()