using System;

using System.Data.SqlClient;

using System.Data;

​

public class Program

{

    public static void Main()

    {

        Func<Object, SqlDbType> getSqlType = val => new SqlParameter("Test", val).SqlDbType;

        Func<Type, SqlDbType> getSqlType2 = type => new SqlParameter("Test", type.IsValueType ? Activator.CreateInstance(type) : null).SqlDbType;

        //returns nvarchar...

        Object obj = "valueToTest";

        getSqlType(obj).Dump();

        getSqlType2(typeof (String)).Dump();

        //returns int...

        obj = 4;

        getSqlType(obj).Dump();

        getSqlType2(typeof (Int32)).Dump();

        //returns bigint...

        obj = Int64.MaxValue;

        getSqlType(obj).Dump();

        getSqlType2(typeof (Int64)).Dump();

    }

}