Getting Error "Type provided must be an Enum."

CCode = (int)Enum.Parse(typeof(EnumHere), cu.ToString())

Enum.Parse requires an enum type. You are parsing it an enumerable CList

UPDATE: User informs that CList is Enum.

ok - if

IEnumerable<clist> objApproverlist = objservice.GetCList(txtbox.Text);

is actually

IEnumerable<CList> objApproverlist = objservice.GetCList(txtbox.Text);

then you don't need that long winded way of getting the int:

var result = from CList cu in objApproverlist select new { CCode = (int)cu, CDescription = cu.ToString() };

But I have tested both ways and it works for me.

Please tell us all the types of the objects you're using

UPDATE 2:
My Test code:

public enum CList
{
    a, b, c, d
}


private static void Main()
{

    IEnumerable<CList> objApproverlist = Enum.GetValues(typeof(CList)).Cast<CList>().AsEnumerable();

    var result = from CList cu in objApproverlist
                 select new { 
                        CCode = (int)Enum.Parse(typeof(CList), cu.ToString()),
                      //I also tried with:
                      //CCode = (int)cu,
                        CDescription = cu.ToString() }; 

    var tempValue = new { CCode = 0, CDescription = "-- Select --" };

    var list = result.ToList(); 

    list.Insert(0, tempValue);


    list.ForEach(a =>
    {
        Console.WriteLine("{0}\t{1}", a.CCode, a.CDescription);
    });
}

This works in both cases. I get the readout {0 a}, {1 b}, etc.