//ConnetionMannger connetionMannger; public List <string> GetCategory(string Query) { ConnetionMannger connetionMannger = new ConnetionMannger(); List <string> Items = new List <string>(); dataTable = connetionMannger.DataTableConnection(Query); foreach (DataRow dr in dataTable.Rows) { string Item = dr[0].ToString(); Items.Add(Item); } return(Items); }