C# SQL linq query error

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SQL-Server-2014

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Dear experts ;
i'm work on c# windows application project using entity framework , sql database and i'm create winform (open form)to search about members and get result in devexpress gridcontrol put the form have many search fields can search by name , code , ip , date from to ,company , brand , model and some radio buttons i need code using linq query to find the members filter by all fields if one or more empty ignore filter and get all else select members with filter

this is a sample code but i need it for all fields type (checkbox , radio ,string ,int ,date ,lookup and combobox)

What I have tried:

string query = "select * from Members where (@name is null or MemberName = @name) and (@code is null or MemberCode = @code)";
var data = db.Members.SqlQuery(query, new SqlParameter("@name", Name), new SqlParameter("@code", code));
memberBindingSource.DataSource = data.ToList(); </pre

Posted 10-Sep-18 15:59pm

Wessam A Halim

Updated 10-Sep-18 20:14pm

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Bryian Tan 10-Sep-18 22:11pm

what the error?

1 solution

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Sunasara Imdadhusen · Accepted Answer · 2018-09-10T19:03:00

Hello Wessam,
You can use below LINQ query

C#

var query = from d in db.Members select d;
//Filter the result based on value passed by user for Member Name
if (!string.IsNullOrEmpty(memName))
    query = query.Where(m => m.MemberName == memName);
//Filter for Member Code
if (!string.IsNullOrEmpty(memCode))
    query = query.Where(m => m.MemberCode == memCode);

//Final query execution
var memberList = query.ToList();

Happy to Help!