The type of the value object did not match the specified RegistryValuekind or the object could not properly converted Registry.SetValue c#

I am using Winforms on .NET 4.5, I try to set registry value.

This is my code:

Registry.SetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile", "NetworkThrottlingIndex", "ffffffff", RegistryValueKind.DWord);

and

Registry.SetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile", "NetworkThrottlingIndex", "0000000a", RegistryValueKind.DWord);

But this raised an error :

> The type of the value object did not match the specified RegistryValuekind or the object could not properly converted

Please help me fix this.

i have to use QWORD instead of DWord , and not using string but actual value :

Registry.SetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile", "NetworkThrottlingIndex", 0xFFFFFFFF, RegistryValueKind.QWord);
Registry.SetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile", "NetworkThrottlingIndex", 0x0000000a, RegistryValueKind.QWord);