C＃调整图像大小

Question

我想在将图像上传到数据库之前调整图像大小。我该怎么办？代码：

        private void SelectBtn_Click(object sender, EventArgs e)
    {
        OpenFileDialog openFile = new OpenFileDialog();

        if (openFile.ShowDialog() == DialogResult.OK)
        {
            imagePath = openFile.FileName;
        }
        FileStream fs1 = new FileStream(imagePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
        image = new byte[fs1.Length];
        fs1.Read(image, 0, Convert.ToInt32(fs1.Length));
        fs1.Close();
        MemoryStream stream = new MemoryStream(image);
        avatarPb.Image = Image.FromStream(stream);
        UpdateBtn.Enabled = true;
    }
    private void UpdateBtn_Click(object sender, EventArgs e)
    {
        using (SqlConnection connection = new SqlConnection(con))
        {
            connection.Open();
            using (SqlCommand cmd = new SqlCommand("UPDATE UserDetails SET Avatar =@avatar WHERE Email =@email", connection))
            {
                cmd.Parameters.AddWithValue("@email", Properties.Settings.Default.Email);
                SqlParameter prm = new SqlParameter("@avatar", SqlDbType.VarBinary, image.Length, ParameterDirection.Input, false, 0, 0, null, DataRowVersion.Current, image);
                cmd.Parameters.Add(prm);
                cmd.ExecuteNonQuery();
            }
            connection.Close();
        }
    }

我希望在将图像上传到数据库之前调整图像大小。非常感谢！