using System;

using System.Reflection;

​

public class Test

{

    public void Main()

    {

        var obj = new Foo();

        string propertyValue = "True";

        PropertyInfo info = obj.GetType().GetProperty("MyProperty");

        var targetType = Nullable.GetUnderlyingType(info.PropertyType);

        if (targetType == null)

            targetType = info.PropertyType;

        info.SetValue(obj, Convert.ChangeType(propertyValue, targetType), null);

        Console.WriteLine("Property Value: " + obj.MyProperty);

    }

    public class Foo

    {

        public bool? MyProperty { get; set; }

    }

}