There are several ways you can convert a number to string in .Net. Few examples are shown below.
string salary;
// Sample 1
salary = 10000.ToString();
// Sample 2
int sal = 10000;
salary = sal.ToString();
// Sample 3
salary = System.Convert.ToString(sal);
// Sample 4
salary = System.Convert.ToString(10000);
The above method can be used to convert various datatypes.