InfoPath Dev

i'm hvaing one repeating section. This ection has two drop downs one is city another one is Hotel . Based on the city selection i want to show the hotels in dropdown. .In sharepoint i have two lists contains the cities. and Hotels in another list . This hotel list has lookup column with the city list as "City Name". I'm using ...

I'm using the same code nut i got an error in the line of "byte[] formData = Convert.FromBase64String(formStream.Value);" as "Object reference not set to an instance of an object". From this line "XPathNavigator formStream = root.SelectSingleNode("//*[local-name() = 'Stream']");" , i got the ...