C# Query Create_Item

I’ve been struggling with converting my GraphQL query into a C# query. All I get is a bad request or a parse error. This is what my query looks like atm.

var query = QueryMondayApi(@"{ ““query””: ““mutation { create_item(board_id: " + BoardId + @”, group_id: " + “new_group61452” + @”, item_name: “”" + item.ProductNumber +
@""", column_values: “”{ \""" + ShipNameId + @"\"": \""" + item.ShipName + @"\"", \"""
+ CcId + @"\"": \""" + item.NoCc + @"\"", \"""
+ EuId + @"\"": \""" + eu + @"\"", \"""
+ OaId + @"\"": \""" + item.Oa + @"\"", \"""
+ GroupNoId + @"\"": \""" + item.GroupNo + @"\"", \"""
+ MustShipId + @"\"": {\"“date\”" : \""" + mustShip + @"\""}, \"""
+ PlannedDateId + @"\"": {\"“date\”" : \""" + plannedDate + @"\""}}""){ id}}""}").Result;

Thanks!

hey,

many people have been struggling with this and fortunately there is a solution.
here is a working solution