linq multiple field search

[zleug]

I have EF Employee table with fields EmpNo, FirstName, LastName, Email. And to create LINQ to search all columns and return existing record. If one or more fields is null or empty the return result based on existing data. I wrote code:


public static int Search(EmployeeDt emp)
{
using (EF.Model1 context = new EF.Model1)
{
List<string> employee = context.Employees.Where(a => (a.EmpNo == null || a.EmpNo == emp.EmpNo)
&& (b => (b.FirstName == null || b.FirstName == emp.FirstName)
&& (c => (c.LastName == null || c.LastName == emp.LastName)).ToList();
return result;
}
}

But code which I tried to write isn't correct. How to write LINQ for my case?

Thanks.

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