Getting Error Invalid Binding Path in SIlverlight -

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i have class class :

[datacontract] public class {     [datamember]     public string name{ get; set; } }

i inheriting class in class b :

[datacontract] public class b : {     public b()     {         name = "me"     } }

and in ui section bind object of class b control , set binding of control below : 

//this code throws error :invalid error  binding = new binding{path = new propertypath(objectb.name),mode = bindingmode.twoway}

edit : value of property guid . "-" in guid causing error ?

new propertypath(objectb.name)

should be

new propertypath("name")

and set 

source = objectb

so, should be:

binding = new binding           {                source = objectb,                path = new propertypath("name"),               mode = bindingmode.twoway           }

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