Improve error message, based ona patch from Brad Langhorst

svn path=/trunk/mcs/; revision=98395

diff --git a/mcs/class/Mono.Data/ProviderFactory.cs b/mcs/class/Mono.Data/ProviderFactory.cs
index f86fce1bf8499784bdb8151b9f51b57584786034..7f0d9899675a9244933441d508d6946650d0ba89 100644 (file)
--- a/mcs/class/Mono.Data/ProviderFactory.cs
+++ b/mcs/class/Mono.Data/ProviderFactory.cs
@@ -99,6 +99,10 @@ namespace Mono.Data
                                throw new System.ArgumentNullException ("ConnectionString");\r
 \r
                        Provider provider = providers [ProviderName];\r
+\r
+                       if (provider == null)\r
+                               throw new ArgumentException ("ProviderName", "The specified provider does not exist");\r
+                       \r
                        IDbConnection conn = provider.CreateConnection ();\r
                        conn.ConnectionString = ConnectionString;\r
                        return conn;\r