static void Main(string[] args) { using (SPSite site = new SPSite("http://serverName/sites/Vijai/")) { using (SPWeb web = site.OpenWeb()) { SPList list = web.Lists.TryGetList("Custom"); if (list != null) { ////Create a calculated field string calculatedColumn = list.Fields.Add("CalculatedColumn", SPFieldType.Calculated, false); ////Get the newly created calculated field SPFieldCalculated calculatedField = list.Fields[calculatedColumn] as SPFieldCalculated; ////Set the calculated field formula calculatedField.Formula = "=[Title]"; ////Set the data type returned from this formula calculatedField.OutputType = SPFieldType.Text; ////Update the calculated field calculatedField.Update(); } } } }