how to compress image size

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ASP.NET

my client wants the image should be (380*380) resolution i have done this through the below given code...Now size should be 50-150 kb... how i can compress the image b/w 50-150kb

  private Bitmap Resize_Image(Stream streamImage, int maxWidth, int maxHeight)
{

    Bitmap originalImage = new Bitmap(streamImage);

    int newWidth = originalImage.Width;
    int newHeight = originalImage.Height;

    if (originalImage.Width > maxWidth)
    {
        newWidth = maxWidth;
    }
    if (originalImage.Height > maxHeight)
    {
        newHeight = maxHeight;
    }
    return new Bitmap(originalImage, newWidth, newHeight);
}


protected void btnUpload_Click(object sender, EventArgs e)
{

    if (imgUpload.HasFile)
    {
        //string img = string.Empty;
        Bitmap bmpImg = null;
        try
        {

            //int fileSize = imgUpload.PostedFile.ContentLength;
           // int maxFileSize = 150;
           // if (maxFileSize > fileSize)
           // {
           //     maxFileSize = fileSize;
           // }
           // else
           // {
            //    maxFileSize = fileSize;
           // }

            bmpImg = Resize_Image(imgUpload.PostedFile.InputStream, 380, 380);
            string fileName = imgUpload.PostedFile.FileName;
            string saveLocation = Server.MapPath("UploadImages/" + fileName);
            bmpImg.Save(saveLocation);
  
        }
        catch (Exception ex)
        {
            Response.Write("Error occured: " + ex.Message.ToString());
        }
        finally
        {
            img = string.Empty;
            bmpImg.Dispose();

        }
    }
}