asp.net mvc - How to update a table row, given the RowID and the Value to update. MVC C# Linq -


here code. paypal sends actionresult rowid item_number , transaction id pp_txn_id. simple want reference row in transaction table, tblpaypaltransactions, , update pp_txn_id see sent me after purchase in paypal. photo links sent downloadpicture.cshtml view.

i can't figure syntax out update transaction table. else can do. stuck here trying finish project. 

//row in photos item_number, paypal paid transaction pp_txn_id public actionresult thankyou(string item_number, string pp_txn_id) {      var photo = db.paypaltransactions.where(x => x.rowid == convert.toint32(item_number));     photo.pp_txn_id = pp_txn_id;     db.submitchanges();      var thispaidphoto = (from p in db.photos                          p.photoid == convert.toint32(item_number)                          select p).firstordefault();      return view(thispaidphoto); }

your current code have compilation errors because where method returns collection. photo variable collection type , not have pp_txn_id property.

assuming rowid unique identifier of record in table, need single record.

you may use firstordefault method.

var rowid=convert.toint32(item_number) var photo = db.paypaltransactions.firstordefault(x => x.rowid ==rowid); if(photo!=null) {    // update    photo.pp_txn_id = pp_txn_id;    db.submitchanges(); } else {   // item not exist in table. handle needed. }

also keep in mind that, convert.toint32 method throw exception if input not valid numeric value. use int32.tryparse safe. if sure values going numeric type, recommend use numeric type param (int or long).


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