How to modify Windows System Registry Values with C#? As usual, you need to use Microsoft.Win32 Namespace ~ using Microsoft.Win32;. Let’s take Windows Application Event Logs values as an example. I want to change the MaxSize and Retention values in Application Event Log file by using C#.

Codes to change Windows System Registry values

RegistryKey TestEventLog = Registry.LocalMachine.OpenSubKey(“System\\CurrentControlSet\\Services\\EventLog\\Application”,true);
TestEventLog.SetValue(“MaxSize”, “102367232″, RegistryValueKind.DWord);
TestEventLog.SetValue(“Retention”, “0″, RegistryValueKind.DWord);

Above codes open Application event log and with write permission (,true). It changes both MaxSize and Retention values.
Just change the codes to suit your need.

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How to read and write Windows System Registry Keys and Values? I need to create a value at Windows System Registry for my project lately. It is used for SCOM discovery. I need a Windows System Registry key to determine that the server is the server that SCOM going to monitor.

First thing to do in your C#. Add using Microsoft.Win32; RegistryKey and Registry requires Microsoft.Win32 as the assembly reference.

Here are the codes that write Windows System Registry Keys.

RegistryKey JayceOoiKey = Registry.LocalMachine.CreateSubKey(“SOFTWARE\\JayceOoi”);

This will create key JayceOoi under HKEY_LOCAL_MACHINE\SOFTWARE\.

To read Test string value from HKEY_LOCAL_MACHINE\SOFTWARE\JayceOoi\

string Output = JayceOoiKey.GetValue(“Test”);

These are the methods that I use to read and write Windows System Registry Keys and Values. Hope it will help in your programming work.

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