Report code in C# explanation

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C#

ASP.NET

this is the code for report .. in this there are two parameters .. now this code look complex and i unable to understand

can anyone please explain this code...

also please suggest how to write this in less line of code.. means i compress this in few lines..

What I have tried:

1st class

private int _ComplainID;
private string _ComplainTokenNo;

public int ComplainID
{ 
    get { return _ComplainID; }
    set { _ComplainID = value; }
}

public string ComplainTokenNo
{ 
    get { return _ComplainTokenNo; }
    set { _ComplainTokenNo = value; }
}

public DataSet GetComplainForEmail()
{
    DataSet ds;
    try
    {
        SqlParameter[] Params = 
        { 
            new SqlParameter("@ComplainID",SqlDbType.Int),
            new SqlParameter("@ComplainTokenNo",SqlDbType.VarChar)
        };
        
        if (ComplainID != 0 && ComplainID != null)
        {
            Params[0].Value = ComplainID;
        }
        else
        {
            Params[0].Value = DBNull.Value;
        }
        
        if (ComplainTokenNo != "" && ComplainTokenNo != null)
        {
            Params[1].Value = ComplainTokenNo;
        }
        else
        {
            Params[1].Value = DBNull.Value;
        }
        
        ds = GetDataSet("SP_De_ComplainMaster_Select_ReportEmail", Params);
        
        return ds;
    }
    catch (Exception ex)
    {
        throw new Exception(ex.Message);
    }
}

2nd class

public void PrintComplainReport(int comID)
{
    ds = new DataSet();

    _sys = new clsDe_ComplainMaster();
    _sys.ComplainID = comID;
    _sys.BranchCode = Session["Branch_Code"].ToString();

    ds = _sys.GetComplainForEmail();

    ReportObj = new ReportInfo();
    ReportObj.ReportFileName = "rptComplain.rpt";
    ReportObj.ReportTitle = "Device Complain";
    ReportObj.ReportDataSet = ds;

    ds.Tables[0].TableName = "Complain";

    Hashtable ReportParameters = new Hashtable();

    sReportId = System.Guid.NewGuid().ToString();

    Session["RptInfo" + sReportId] = ReportObj;

    string sUrl = "~/Common/Reports/Viewer.aspx?RptId=" + sReportId;

    ScriptManager.RegisterStartupScript(this, this.GetType(), "newtab", "window.open('" + ResolveUrl(sUrl) + "');", true);
}