How to write a generic conversion method which would support converting to and from nullable types? [duplicate]

Question

Possible Duplicate:
How can I fix this up to do generic conversion to Nullable<T>?

public static class ObjectExtensions
    {
        public static T To<T>(this object value)
        {
            return (T)Convert.ChangeType(value, typeof(T));
        } 
    }

My above extension method helps converting a type to another type but it doesn't support nullable types.

For example, {0} works fine but {1} doesn't work:

{0}:
var var1 = "12";
var var1Int = var1.To<int>();

{1}:
var var2 = "12";
var var2IntNullable = var2.To<int?>();

So, how to write a generic conversion method which would support converting to and from nullable types?

Thanks,

Answer 1

This works for me:

public static T To<T>(this object value)
{
    Type t = typeof(T);

    // Get the type that was made nullable.
    Type valueType = Nullable.GetUnderlyingType(typeof(T));

    if (valueType != null)
    {
        // Nullable type.

        if (value == null)
        {
            // you may want to do something different here.
            return default(T);
        }
        else
        {
            // Convert to the value type.
            object result = Convert.ChangeType(value, valueType);

            // Cast the value type to the nullable type.
            return (T)result;
        }
    }
    else 
    {
        // Not nullable.
        return (T)Convert.ChangeType(value, typeof(T));
    }
}