Upload CSV to Google Spreadsheet in a new sheet using C# -

i able add new sheet exisiting google spreadsheet via sheets api using code below. how import csv new sheet ?

//auth code sheets api above line sheetsservice sheetsservice = new sheetsservice(bc_init);                 string spreadsheetid = "xxxxxx";                 string sheetname = datetime.now.tostring();                  var addsheetrequest = new addsheetrequest();                 addsheetrequest.properties = new sheetproperties();                 addsheetrequest.properties.title = sheetname;                  batchupdatespreadsheetrequest batchupdatespreadsheetrequest = new batchupdatespreadsheetrequest();                 batchupdatespreadsheetrequest.requests = new list<request>();                 batchupdatespreadsheetrequest.requests.add(new request                 {                     addsheet = addsheetrequest                  });                 var batchupdaterequest = sheetsservice.spreadsheets.batchupdate(batchupdatespreadsheetrequest, spreadsheetid);                 batchupdaterequest.execute();