IniFile is a single C# file that offers reading from and writing to INI files. You can drop it straight into your project; no DLL references needed.
// [foo]
// bar=1
// baz=qux
// [foo2]
// bar=2
var iniFile = new IniFile("foo.ini");
iniFile.Section("foo").Get("bar"); // "1"
iniFile.Section("foo").Get("baz"); // "qux"
foreach (var section in iniFile.Sections)
Console.WriteLine(section.Name); // foo
// foo2
var iniFile = new IniFile();
iniFile.Section("foo").Comment = "This is foo";
iniFile.Section("foo").Set("bar", "1");
iniFile.Section("foo").Set("baz", "qux", comment: "baz is qux");
iniFile.Section("foo2").Set("bar", "2");
iniFile.Save("foo.ini");
// # This is foo
// [foo]
// bar=1
// # baz is qux
// baz=qux
//
// [foo2]
// bar=2
iniFile.Section("foo").RemoveProperty("bar"); // or iniFile.Section("foo").Set("bar", null);
iniFile.RemoveSection("foo2");
iniFile.Save("foo.ini");
// # This is foo
// [foo]
// # baz is qux
// baz=qux