=Globals!ReportServerUrl.ToString() + "/Pages/ReportViewer.aspx?"
+ System.Web.HttpUtility.UrlEncode("https://ReportServer/ReportFolder/Report.rdl")
+ "&rs:Command=Render&rs:Format=EXCEL&rc:OmitFormulas=true"
+ "&[Parameter_Name1]=" + Join(Parameters![Parameter_Name1].Value, "&[Parameter_Name1]=") --> Multivalue Parameter
+ "&[Parameter_Name2]=" + System.Web.HttpUtility.UrlEncode(Parameters![Parameter_Name2].Value) --> Normaler Paraemter


It is important to use the HttpUtility.UrlEncode() function in order to pass the correct values.
In the properties dialog of the report add a reference to the System.Web assembly.

SQL Server 2005 Service Pack 1 brings a new feature: caching data in BIDS (Business Intelligence Development Studio) Report Designer. Following objects are cached: all the data query, parameter value and credentials for previewing a report. Sometimes this feature can be annoying, if changes in preview mode should be visible immediately.

In order to disable the caching feature, following key has to be added to the config file ‘RSReportDesigner.config‘.

Key:
<Add Key="CacheDataForPreview" value="False" />

Location:
C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies\RSReportDesigner.config
To clear the cache you can also delete the *.data cache file which is located in the report RDL directory.

SSRS: Caching Files (Preview Mode)

ReportParameter[] parameters = new ReportParameter[2];

protected void Page_Load(object sender, EventArgs e) {
parameters[0] = new ReportParameter("wave_id", "28");
parameters[1] = new ReportParameter("mpc_id", "1530");
ReportViewer1.ServerReport.SetParameters(parameters);
}