How i prepare parameterized(with more than one parameters) crystal report?

code:

ParameterFields paramFields = new ParameterFields(); 

//setdata ParameterField 

param_date = new ParameterField(); 

param_date.ParameterFieldName = "date"; 

ParameterDiscreteValue d = new ParameterDiscreteValue(); 

d.Value = this.date+" - "+this.datesf; 

param_date.CurrentValues.Add(d); 

paramFields.Add(param_date); 

//set number 

ParameterField param_no = new ParameterField(); 

param_no.ParameterFieldName = "number"; 

ParameterDiscreteValue number = new ParameterDiscreteValue(); 

if (this.no==0) 

number.Value = ""; 

else 

number.Value = this.no.ToString(); 

param_no.CurrentValues.Add(number); 

paramFields.Add(param_no); 

//and so on 

repview_total.ParameterFieldInfo = paramFields;