C# - Ini Reader

public string GetValueFromIni(string key, string iniFilePath)
{
    string keyValue = null;
    string line     = null;

    using (FileStream filestream = new FileStream(iniFilePath, FileMode.Open, FileAccess.Read))
    {
        using (StreamReader reader = new StreamReader(filestream))
        {
            while (!reader.EndOfStream)
            {
                line = reader.ReadLine();
                if (line.StartsWith(key))
                {
                    keyValue = line.Substring(line.IndexOf('=') + 1);
                }
            }
        }
    }
    return keyValue;
}