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C# Tutorial - Difference between Convert.ToString() and ToString()

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To understand the difference consider the example below. The ToString() method, expects the instance on which you are invoking to be NOT NULL. If the object is NULL, you get a NULL Reference exception.

using System;
public class MainClass
{
    public static void Main()
    {
        Customer C1 = null;
        Console.WriteLine(C1.ToString());
    }
}
public class Customer
{
    public string Name { getset; }
}

On the other hand, Convert.ToString() returns an empty string if the object is NULL.
using System;
public class MainClass
{
    public static void Main()
    {
        Customer C1 = null;
        Console.WriteLine(Convert.ToString(C1));
    }
}
public class Customer
{
    public string Name { getset; }
}


So in summary, Convert.ToString() handles null, while ToString() doesn't, and throws a NULL Reference exception. Depending on the type of the application, architecture and what you are trying to achieve, you choose one over the other.

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