Proxy webreference for asmx webservice has void return type in endoperation

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C#

Xamarin

I have a asmx webservice returning JSON data. But when I add webreference 2.0, I am getting void return type on my end operation

example data when I make direct call to URL "http://XX.XXX.XX.XX:88/tabsaleswithdatasync.asmx/FeatureMaster"

[{"msg":"","FeatureSlno":"2","Feature":"Fuel Used","DefaultValue":"","FeatureType":"B","Groups":"OverView","GroupOrder":"0","SubGroupOrder":"0","CategorySlno":"2","UtilisationSlno":"1","IconImagePath":"","LowerIsBetter":"0"},{"msg":"","FeatureSlno":"3","Feature":"Seating Capacity","DefaultValue":"","FeatureType":"B","Groups":"OverView","GroupOrder":"0","SubGroupOrder":"0","CategorySlno":"3","UtilisationSlno":"0","IconImagePath":"","LowerIsBetter":"0"}]

proxy webservice generated using wsdl is

public System.IAsyncResult BeginFeatureMaster(System.AsyncCallback callback, object asyncState)
{
return this.BeginInvoke("FeatureMaster", new object[0], callback, asyncState);
}


public void EndFeatureMaster(System.IAsyncResult asyncResult)
{
this.EndInvoke(asyncResult);
}


Why am i not getting return type as object as I require ???

What I have tried:

Right click on project and add webreference option