setparameters in reportviewer

i need to set values to parameters in a reportviewer for winForms.
i created  a textbox with the name Title
and i want do assign at runtime the value
for example Titel="List of Services" or "List of Customers"
but  i wrote this.
rpSolicitudServicios is the name of the report.

ReportParameterInfoCollection info = rpSolicitudServicios.LocalReport.GetParameters();
but info is always null i have tried many things


i just want to know how to get and set parameters as in this case i
have explained but for winform