How to read/write value from registry using C#.Net?

 In the winform some time we need to access the registry value or we need to modify the registry value to store or get some important information. For that in C# have simple option to handle the registry read/write using Microsoft.Win32.RegistryKey namespace. The below two methods will explain how to read key value from the local registry.


Save Value to Registory:
The WriteToRegistry method will write the value to registry based on Keyname. The Keyname must be exist before in the registry.

 public static void WriteToRegistry(string keyname, string keyvalue)

        {

            Microsoft.Win32.RegistryKey MainRootKey = null;

            Microsoft.Win32.RegistryKey subKey = null;                        

            try

            {

                MainRootKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE ", true);

                if (MainRootKey!= null)

                {

                    subKey = rootKey.OpenSubKey("MyApplication", true);                  

                    if (subKey != null)

                    {

                        subKey.SetValue(keyname, keyvalue);

                        subKey.Close();

                    }

                }

            }

            catch (Exception ex)

            {

                throw ex;

            }

            finally

            {

                if (subKey != null)

                    subKey.Close();

                subKey = null;

                if (MainRootKey != null)

                    MainRootKey.Close();

                MainRootKey = null;

            }

        }

How to read MyApplication Registry information using C#.net ?

 The GetFromRegistry Method will return the registry value based on the KeyName. The Keyname should be exist before in the registry.

private string GetFromRegistry(string keyname)
        {
            string strReturn = string.Empty;
            RegistryKey objReg = Registry.LocalMachine.OpenSubKey("SOFTWARE").OpenSubKey("MyApplication");
            if (objReg != null && objReg.GetValue(keyname) != null)
                strReturn = objReg.GetValue(keyname).ToString();
 
            return strReturn;
 
        }