cannot implicitily convert type bool to sysytem.data.dataset

Question

#region Print Patient Consultation
protected void printPatientConsultation(string strOption)
{
lblMessage.Visible = false;
ReportDocument rptDoc = new ReportDocument();
System.IO.MemoryStream oStream = new System.IO.MemoryStream();
rptDoc.PrintOptions.PaperSize = CrystalDecisions.Shared.PaperSize.PaperA4;
rptDoc.PrintOptions.PaperOrientation = PaperOrientation.Landscape;
string strUserName = Session["USER"].ToString();
PatientBL objPatientBL = new PatientBL();
int numCompID = Convert.ToInt32(Session["COMPID"]);
int numClinicid = 0;
string strClinicids = "";
if (ddlclinic.SelectedValue != "")
{
numClinicid = Convert.ToInt32(ddlclinic.SelectedValue);
}
else
{
strClinicids = Session["CLINICIDS"].ToString();
}
DataSet objPatientDS = objPatientBL.PrintPatientConsultation(numCompID);

this gray line show me error cannot implicitily convert type bool to sysytem.data.dataset

 

pls help me to solve error