public int DeleteMasterSignalsByNameSpace(string nameSpace)
{
int count;
string sql = BuildDeleteSqlStatement( SignalMasterBean._TABLE_NAME, new List<string>() {SignalMasterBean._XMLNS} );
OleDbParameter[] dbParams = { CreateParameter(SignalMasterBean._XMLNS, nameSpace) };
ExecuteSqlCommand( sql, dbParams, out count );
return count;
}