/// <summary>
/// Update picture of existing user.
/// </summary>
/// <param name="userId">Id of the user.</param>
/// <param name="pictureData">Picture data.</param>
/// <param name="fileName">Name of the picture.</param>
/// <param name="mimeType">Extension of the picture.</param>
public void UpdateUserPicutre(string userId, byte[] pictureData, string fileName, string mimeType = "image/jpeg")
{
string url = string.Format("{0}/{1}/picture", UrlConstants.USER, userId);
BaseInfoProvider <byte[]> .PostFile(url, pictureData, fileName, mimeType, "kermit", "kermit");
}