How to pass parameter to RDLC report with a dynamically created dataset as its datasource

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C#

Parameter

RDLC

dataset

In my Windows Forms Application, i want to create a report. i have created an .rdlc file and assigned it a "dummy" dataset as a datasource just to get the schema, as described here :

http://blogs.msdn.com/b/sqlforum/archive/2011/04/28/sql-reporting-services-ssrs-bind-dynamic-dataset-to-your-local-report-with-reportviewer.aspx[^]

i want to change datasource of my report dynamically in the code. i found many examples like the following:

private DataTable getData()
{
    DataSet dss = new DataSet();
    string sql = "";
    sql = "SELECT ID, CLIENT_ID, AGENT_ID FROM TBLMAILDELETED";
    OdbcDataAdapter da = new OdbcDataAdapter(sql, conn);
    da.Fill(dss);
    DataTable dt = dss.Tables[0];
    return dt;
}

private void runRptViewer()
{
    this.ReportViewer1.Reset();
    this.ReportViewer1.LocalReport.ReportPath = Server.MapPath("Report.rdlc");
    ReportDataSource rds = new ReportDataSource("dsNewDataSet_Table", getData());
    this.ReportViewer1.LocalReport.DataSources.Clear();
    this.ReportViewer1.LocalReport.DataSources.Add(rds);
    this.ReportViewer1.DataBind();
    this.ReportViewer1.LocalReport.Refresh();
}

i want to place similar code on a button click. my question is:
if i want to add a parameter whose value is entered in a textbox on the form, what is the best way to do it?

1- should i add it in code as a parameter in my DataAdapter, and then my query will have a where-clause that uses that parameter to filter results ?
2- should i create ReportParameter and add it to my .rdlc? if so: how will that change the code? and how should that affect my DataAdapter query?

thanks in advance