Converting a piece of code from VB to C#

A Year or so I wrote a piece of code in VB to allow me to have an array of objects that could be tested to sse if they existed i.e. not null.  I am trying to convert this to C#.  I have got the conversion this far.

    public class DataServices
    {
        public static T? Coalesce<T>(T Obj, params T[] Args)      
        {
            if (Obj != null && IsDBNull(Obj))
            {
                return Obj;
            }
            else 
            {
                foreach (T arg in Args )
                {
                    if (arg != null && IsDBNull(arg)) return arg; 
                }
            }
            return null;
         }

        public static Boolean IsDBNull(Object Value)
        {
            return DBNull.Value.Equals(Value);  
        }
    }

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The original looked like this.

 Public Shared Function Coalesce(Of T)(ByVal obj As T, ByVal ParamArray Args() As T) As T

        If obj IsNot Nothing AndAlso Not IsDBNull(obj) Then
            Return obj
        End If

        For Each arg As T In Args
            If arg IsNot Nothing AndAlso Not IsDBNull(obj) Then
                Return arg
            End If
        Next

        Return Nothing
    End Function

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The error I am getting is

Error      1      The type 'T' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'System.Nullable<T>'      C:\Users\carl.symington\Documents\Visual Studio 2012\Projects\DataServices\DataServices\DataServices.cs      11      26      DataServices

I suspect it is to do with where I have tried to put T? making T a nullable object.