Change custom attribute's parameter at runtime

I need change attribute's parameter during runtime. I simplified my problem to simple example. Attribute class: ``` [AttributeUsage(AttributeTargets.Property)] public class MyAttribute : Attribute { public string Name { get; set; } } ``` Simple entity which has decorated properties with attributes: ``` public class MyEntity { [MyAttribute(Name="OldValue1")] public string Data1{ get; set; } [MyAttribute(Name = "OldValue2")] public string Data2 { get; set; } } ``` I created instance of class MyEntity. I can change value of object's properties, but I can't change value of attribute’s property Name on object entity. Is it possible? Value of property on object entity I can change with this part of code: ``` entityProp.SetValue(entity,"NewData",null); ``` but I don't how change value of attribute's property Name on object entity This does not work: ``` attProp.SetValue(attribute,"NewData",null); ``` Value of property Name is still original. Here is all test code. ``` [TestMethod] public void Test() { var entity = new MyEntity { Data1 = "OldData", Data2 = "OldData" }; PropertyInfo[] entityProps = entity.GetType().GetProperties(); foreach (var entityProp in entityProps) { var attribute = Attribute.GetCustomAttribute(entityProp, typeof (MyAttribute)) as MyAttribute; if (attribute != null) { //get attribute's property NAME PropertyInfo attProp= attribute.GetType().GetProperty("Name"); //get entity property value var propertyValue = entityProp.GetValue(entity, null); //get attribute’s property NAME value var atributeNameValue = attProp.GetValue(entity, null); TestContext.WriteLine(string.Format("property name:{0} property value: {1} : atribute name value: {2}\n", entityProp.Name, propertyValue, atributeNameValue)); //change values entityProp.SetValue(entity,"NewData",null); //how can I change value of property Name on object entity ? attProp.SetValue(attribute,"NewData",null); } } TestContext.WriteLine(string.Format("After change\n")); foreach (var entityProp in entityProps) { var attribute = Attribute.GetCustomAttribute(entityProp, typeof(MyAttribute)) as MyAttribute; if (attribute != null) { PropertyInfo attProp = attribute.GetType().GetProperty("Name"); var propertyValue = entityProp.GetValue(entity, null); var atributeNameValue = attProp.GetValue(entity, null); TestContext.WriteLine(string.Format("property name:{0} property value: {1} : atribute name value: {2}\n", entityProp.Name, propertyValue, atributeNameValue)); } } } ``` EDITED: I delete original post and added very simple clear sample. Sorry