I want to Compare two Values in IF else

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C#

C#4.0

Hy
I want to check that the current Username is available in that department or not Department_Id

How i Apply that in if else statement

string Username = User.Identity.Name;   // Current Username
DataTable dt;
Employee_In_Department Depart_Class = new Employee_In_Department();
Depart_Class.Retrieve_Employee_In_Department_By_All(ref Connection_string, out dt);
List(byte) arr = new List(byte)();
for (int i = 0; i < dt.Rows.Count; i++)
{
   arr.Add(Convert.ToByte(dt.Rows[i]["Department_Id"])); // All Department Id in table
}

if (Username ==arr )
{

}