Something

builder@x64-linux-1:~/martin/debugger/build> pwd
/home/builder/martin/debugger/build
builder@x64-linux-1:~/martin/debugger/build> cat ../test/src/TestSimple.cs
using System;

class X
{
        static void Main ()
        {
                Uri uri = new Uri ("http://www.mono-project.com/");
                Console.WriteLine (uri);
        }
}
builder@x64-linux-1:~/martin/debugger/build> gmcs ../test/src/TestSimple.cs
builder@x64-linux-1:~/martin/debugger/build> mdb -run ../test/src/TestSimple.exe
Mono Debugger
Starting program: ../test/src/TestSimple.exe
Symbol file `/home/builder/martin/debugger/test/src/TestSimple.exe.mdb' does not match assembly `/home/builder/martin/debugger/test/src/TestSimple.exe'
Thread @1 stopped at #0: 0x4001aa70 in <X:Main ()>+0x10 at 2.
   2 IL_0005: newobj    0x0a000002
(mdb) q
The program is running.  Exit anyway? (y or n) y
Thread @1 exited normally.
Process #1 exited.
Target exited.
builder@x64-linux-1:~/martin/debugger/build> clear

builder@x64-linux-1:~/martin/debugger/build> pwd
/home/builder/martin/debugger/build
builder@x64-linux-1:~/martin/debugger/build> cat ../test/src/TestSimple.cs
using System;

class X
{
        static void Main ()
        {
                Uri uri = new Uri ("http://www.mono-project.com/");
                Console.WriteLine (uri);
        }
}
builder@x64-linux-1:~/martin/debugger/build> gmcs -debug ../test/src/TestSimple.cs
builder@x64-linux-1:~/martin/debugger/build> mdb -run ../test/src/TestSimple.exe
Mono Debugger
Starting program: ../test/src/TestSimple.exe
Thread @1 stopped at #0: 0x4001aa70 in X.Main()+0x10 at /home/builder/martin/debugger/test/src/TestSimple.cs:7.
   7            Uri uri = new Uri ("http://www.mono-project.com/");
(mdb) n
Thread @1 stopped at #0: 0x4001aa8d in X.Main()+0x2d at /home/builder/martin/debugger/test/src/TestSimple.cs:8.
   8            Console.WriteLine (uri);
(mdb) p uri
(System.Uri) { "http://www.mono-project.com/" }
(mdb) ptype uri
class System.Uri : System.Object
{
   bool isUnixFilePath;
   string source;
   string scheme;
   string host;
   int port;
   string path;
   string query;
   string fragment;
   string userinfo;
   bool isUnc;
   bool isOpaquePart;
   bool isAbsoluteUri;
   string[] segments;
   bool userEscaped;
   string cachedAbsoluteUri;
   string cachedToString;
   string cachedLocalPath;
   int cachedHashCode;
   System.UriParser parser;
   const int MaxUriLength = 32766;
   static string hexUpperChars;
   static string SchemeDelimiter;
   static string UriSchemeFile;
   static string UriSchemeFtp;
   static string UriSchemeGopher;
   static string UriSchemeHttp;
   static string UriSchemeHttps;
   static string UriSchemeMailto;
   static string UriSchemeNews;
   static string UriSchemeNntp;
   static string UriSchemeNetPipe;
   static string UriSchemeNetTcp;
   static System.Uri/UriScheme[] schemes;
   string AbsolutePath { get; };
   string AbsoluteUri { get; };
   string Authority { get; };
   string Fragment { get; };
   string Host { get; };
   System.UriHostNameType HostNameType { get; };
   bool IsDefaultPort { get; };
   bool IsFile { get; };
   bool IsLoopback { get; };
   bool IsUnc { get; };
   string LocalPath { get; };
   string PathAndQuery { get; };
   int Port { get; };
   string Query { get; };
   string Scheme { get; };
   string[] Segments { get; };
   bool UserEscaped { get; };
   string UserInfo { get; };
   string DnsSafeHost { get; };
   bool IsAbsoluteUri { get; };
   string OriginalString { get; };
   System.UriParser Parser { get; set; };
   void System.Runtime.Serialization.ISerializable.GetObjectData (System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext);
   void EnsureAbsoluteUri ();
   void Canonicalize ();
   void CheckSecurity ();
   bool Equals (object);
   bool InternalEquals (System.Uri);
   int GetHashCode ();
   string GetLeftPart (System.UriPartial);
   System.Uri MakeRelativeUri (System.Uri);
   string MakeRelative (System.Uri);
   string ToString ();
   void GetObjectData (System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext);
   void Escape ();
   void Parse ();
   void ParseUri ();
   string Unescape (string);
   void ParseAsWindowsUNC (string);
   void ParseAsWindowsAbsoluteFilePath (string);
   void ParseAsUnixAbsoluteFilePath (string);
   void Parse (string);
   string GetOpaqueWiseSchemeDelimiter ();
   bool IsBadFileSystemCharacter (char);
   bool IsReservedCharacter (char);
   string GetComponents (System.UriComponents, System.UriFormat);
   bool IsBaseOf (System.Uri);
   bool IsWellFormedOriginalString ();
   static System.UriHostNameType CheckHostName (string);
   static bool IsIPv4Address (string);
   static bool IsDomainAddress (string);
   static bool CheckSchemeName (string);
   static bool IsAlpha (char);
   static int FromHex (char);
   static string HexEscape (char);
   static char HexUnescape (string, int&);
   static bool IsHexDigit (char);
   static bool IsHexEncoding (string, int);
   static string EscapeString (string);
   static string EscapeString (string, bool, bool, bool);
   static string Unescape (string, bool);
   static string Reduce (string);
   static char HexUnescapeMultiByte (string, int&, char&);
   static string GetSchemeDelimiter (string);
   static int GetDefaultPort (string);
   static bool IsExcludedCharacter (char);
   static bool IsPredefinedScheme (string);
   static int Compare (System.Uri, System.Uri, System.UriComponents, System.UriFormat, System.StringComparison);
   static bool NeedToEscapeDataChar (char);
   static string EscapeDataString (string);
   static bool NeedToEscapeUriChar (char);
   static string EscapeUriString (string);
   static bool IsWellFormedUriString (string, System.UriKind);
   static bool TryCreate (string, System.UriKind, System.Uri&);
   static bool TryCreate (System.Uri, string, System.Uri&);
   static bool TryCreate (System.Uri, System.Uri, System.Uri&);
   static string UnescapeDataString (string);
   static int GetInt (System.Byte);
   static int GetChar (string, int, int);
   static char[] GetChars (System.IO.MemoryStream, System.Text.Encoding);
   .ctor (string);
   .ctor (System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext);
   .ctor (string, System.UriKind);
   .ctor (System.Uri, System.Uri);
   .ctor (string, bool);
   .ctor (System.Uri, string);
   .ctor (System.Uri, string, bool);
   .cctor ();
}
(mdb) q
The program is running.  Exit anyway? (y or n) y
Thread @1 exited normally.
Process #1 exited.
Target exited.
builder@x64-linux-1:~/martin/debugger/build>