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First() :

I will prefer using First() when I am confident about collection or sequence that it contains at least one element.

FirstOrDefault():

I will prefer FirstOrDefault() when I don’t know whether collection or sequence contains element, FirstOrDefault() handles null or empty sequence by itself that is main difference.

Code example:

var Dptms = (from d in BlogDbContext.Department
             join u in BlogDbContext.User
             on new { PID = d.CreatedBy } equals new { PID = u.UserId }
                        select new
                            {
                              DepartmentId = d.DepartmentId,
                              DeptName = d.DeptName,
                              Description = d.Description,
                             CreatedBy = u.UserName
 
                             }
 
                     ).ToList();
//First() extension method
if (Dptms.Any())
   { var FirstDeprtment =Dptms.First();
   }
//FirstOrDefault() extension method
var FirstDept = Dptms.FirstOrDefault();

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