How to get int math.random round number?

Question

Hi,

 

Let's say, if I want to set Math.random(); in variable.

 

 

'idPartnerProject'  model class object, some times it will cotain integer also,

 

 foreach (var partnerProjecttemp in pageVM.Form5.Projects)
                {
                    partnerProjectBL.idPartnerProject = Convert.ToInt32(partnerProjecttemp.idPartnerProject);
/*if idPartnerProject id existing then update record, not exist add a new record*/
}

 

 

 And,

 

  But now error raising, Input string was not in a correct format.

 

How can I solve this?