c# - Retrieve Account Number using account GUID in Dynamics CRM -

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i'm new linq please apology if ask wrong question. want retrieve account number in dynamics crm using account guid , linq. unable find. i've following snippet gives me exception specified cast not valid

 accountid = (guid)contact["parentcustomerid"];  var account = in context.createquery("account")  a.getattributevalue<guid?>("accountid") == accountid  select new {accountnumber = a["accountnumber"] };

what accountid ? guid or nullable<guid>

try below snippet:

accountid = (guid)contact["parentcustomerid"]; var account = in context.createquery("account") a.getattributevalue<guid>("accountid") == accountid select new {accountnumber = a.getattributevalue<int>("accountnumber") };

you can use query expression. easy use:

queryexpression queryexpression = new queryexpression("account"); queryexpression.columnset = new columnset("accountnumber"); queryexpression.criteria.addcondition("accountid", conditionoperator.equal, accountid);

or 

_service.retrieve("account", accountid, new columnset("accountnumber"));

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