Get Sheet Names in Excel

using System.Data.OleDb;

public DataTable ExcelSheetNames(string excelFile)
        {
            OleDbConnection objConn = null;
            System.Data.DataTable dt = null;
            try
            {
                String connString = "Provider=Microsoft.Jet.OLEDB.4.0;" +
                    "Data Source=" + excelFile + ";Extended Properties=Excel 8.0;";
                objConn = new OleDbConnection(connString);
                objConn.Open();
                dt = objConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                if (dt == null)
                {
                    return null;
                }
                return dt;
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {               
                if (objConn != null)
                {
                    objConn.Close();
                    objConn.Dispose();
                }
                if (dt != null)
                {
                    dt.Dispose();
                }
            }
        }