How to check IN Clause Condition in LINQ

List<int> ObjCircleList = null;

ObjCircleList = new List<int>();

for (int i = 0; i < ddlCircle.SelectedValue.Split(',').Count(); i++)

{

ObjCircleList.Add(Convert.ToInt32(ddlCircle.SelectedValue.Split(',')[i]));

}

string CentreNames = "", CentreIds = "";

foreach (Center c in Dbi.Contactss.ListContacts(db, 10).Where(p => ObjCircleList.Contains(p.CorpCenterId)).OrderBy(p => p.Center_name))

{

CentreNames = CentreNames + c.Center_name.Trim().TrimEnd() + "|";

CentreIds = CentreIds + c.id.ToString() + "|";

}