throw special errors for db ops

app/BrainpoolXmlParser/DB.vb

@@ -83,8 +83,7 @@ Public Class DB
 
             Return result
         Catch ex As Exception
-            Console.WriteLine("Error while executing SQL Scalar-Query ({0}): {1}", queryString, ex.Message)
+            Throw New Exception(String.Format("Error while executing SQL Scalar-Query ({0}): {1}", queryString, ex.Message))
-            Return Nothing
         End Try
     End Function
 
@@ -102,8 +101,7 @@ Public Class DB
 
             Return True
         Catch ex As Exception
-            Console.WriteLine("Error while executing SQL Query ({0}): {1}", queryString, ex.Message)
+            Throw New Exception(String.Format("Error while executing SQL Non-Query ({0}): {1}", queryString, ex.Message))
-            Return False
         End Try
     End Function
 
@@ -121,8 +119,7 @@ Public Class DB
 
             Return dt
         Catch ex As Exception
-            Console.WriteLine("Error while executing SQL Non-Query ({0}): {1}", queryString, ex.Message)
+            Throw New Exception(String.Format("Error while executing SQL Query ({0}): {1}", queryString, ex.Message))
-            Return Nothing
         End Try
     End Function