public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
    {

        SqlCommand cmd = new SqlCommand();
        InteCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        cmd.Parameters.Clear();
        return ds;
    }

首先：你这段代码报什么错了？
其次：
InteCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
这个方法里做了什么？代码是什么？

InteCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
既然是NULl为什么还要类型转换？