All-purpose SqlHelper help class

/// <summary>    ///Database Helper Classes/// </summary>     Public classSQLHelper {Private Static stringConnStr ="server=.; database=***;uid=**;p wd=***"; //Defining Objects        Private StaticSqlConnection conn =NULL; Private StaticSqlCommand cmd =NULL; Private StaticSqlDataAdapter SDA =NULL; Private StaticDataSet ds =NULL; /// <summary>        ///querying multi-row multiple columns/// </summary>         Public StaticDataSet Search (stringSqlparamssqlparameter[] Parameters) {            Try            {                using(conn =NewSqlConnection (CONNSTR)) {Conn.                    Open (); CMD=NewSqlCommand (SQL, conn); foreach(SqlParameter Pinchparameters) {cmd.                    Parameters.Add (P); } SDA=NewSqlDataAdapter (CMD); DS=NewDataSet (); Sda.                    Fill (DS); returnds; }            }            Catch(Exception ex) {Throw NewException (ex.            Message); }            finally{Conn.            Close (); }        }        /// <summary>        ///Query single row/// </summary>         Public Static ObjectExecuteScalar (stringSqlparamssqlparameter[] Parameters) {            Try            {                using(conn =NewSqlConnection (CONNSTR)) {Conn.                    Open (); CMD=NewSqlCommand (SQL, conn); foreach(SqlParameter Pinchparameters) {cmd.                    Parameters.Add (P); }                    Objectobj =cmd.                    ExecuteScalar (); returnobj; }            }            Catch(Exception ex) {Throw NewException (ex.            Message); }            finally{Conn.            Close (); }        }        /// <summary>        ///Query single row (add and revise)/// </summary>         Public Static intExecuteNonQuery (stringSqlparamssqlparameter[] Parameters) {            Try            {                using(conn =NewSqlConnection (CONNSTR)) {Conn.                    Open (); CMD=NewSqlCommand (SQL, conn); foreach(SqlParameter Pinchparameters) {cmd.                    Parameters.Add (P); }                    introw =cmd.                    ExecuteNonQuery (); returnRow; }            }            Catch(Exception ex) {Throw NewException (ex.            Message); }            finally{Conn.            Close (); }        }    }

All-purpose SqlHelper help class