Ini 파일에 대한 클래스를 정의한다.

public class IniFile
{
    [DllImport("kernel32.dll")]
    private static extern int GetPrivateProfileString(
        String section, String key, String def, StringBuilder retVal, int Size, String filePat);

    [DllImport("Kernel32.dll")]
    private static extern long WritePrivateProfileString(
        String Section, String Key, String val, String filePath);

    public void IniWriteValue(String Section, String Key, String Value, string avaPath)
    {
        WritePrivateProfileString(Section, Key, Value, avaPath);
    }

    public String IniReadValue(String Section, String Key, string avsPath)
    {
        StringBuilder temp = new StringBuilder(2000);
        int i = GetPrivateProfileString(Section, Key, "", temp, 2000, avsPath);
        return temp.ToString();
    }
}

Ini파일을 Write..

Private IniFile inifile = new inifile();

//inifile.IniWriteValue(섹션이름, 키이름, 값, Inifile생성 위치);
inifile.IniWriteValue("Section1", "Key", "Value", "./test.ini");