How do I increase a number by one with a value stored in dictionary? C#

Question

//GETS CUSTOMERSNAME
static Dictionary<string, int> _Names = new Dictionary<string, int>
{

{"LIAM O'BRIEN", 29},
{"CIARAN O'BRIEN", 30},

};

public static void RecordData(string CustomerNameCheck,int NumberOfBookings)
{
try
{
_Names.Add(CustomerNameCheck, NumberOfBookings);
}
catch (ArgumentException)
{

Console.WriteLine("Value found!");
Console.ReadKey();
}
}
Just started to learn to program for the first time and I am currently trying to build a cinema app.

{"LIAM O'BRIEN", 29},
29 is the number of bookings made, I want to increase that number by one once the customer "LIAM O'BRIEN" completes another booking.

Any suggestions?

Answer 1

Simplest way:

_Names["LIAM O'BRIEN"] = _Names["LIAM O'BRIEN"] + 1;

More detail:

https://code-maze.com/csharp-update-the-value-stored-in-a-dictionary/