Question

How can I convert int (StaffID) to string in the below method. It wont accept Guid.NewGuid(ToString)

public void submitStaffID(StaffEnity staff)
{
    staff.StaffID = Convert.ToInt32(Guid.NewGuid(ToString));
    StaffEntity.Add(staff);
}

No overload for method NewGuid takes 1 argument.

namespace StaffEntity
{
    [DataContract]
    public class StaffEnity
    {
        [DataMember]
        public int StaffID;
        [DataMember]
        public string Forename;
        [DataMember]
        public string Surname;
        [DataMember]
        public DateTime TimeAdded;
    }
}

Answer 1

You’re looking for this:

staff.StaffID = Convert.ToInt32(Guid.NewGuid().ToString());

But converting it afterward to int32 won’t work!

From MSDN:

A GUID is a 128-bit integer (16 bytes) that can be used across all
computers and networks wherever a unique identifier is required. Such
an identifier has a very low probability of being duplicated.

An int structure, on the other hand:

Represents a 32-bit signed integer.

So, you can’t convert from Guid to int without loosing most of the
information.

https://stackoverflow.com/questions/4518684/convert-guid-to-int

You probably meant this

staff.StaffID = new Random().Next(int.MinValue, int.MaxValue);

Note for proper use of the Random class:
Random number generator only generating one random number