C# 下划线转驼峰

        /// <summary>
        /// 转换
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            string tb1 = textBox1.Text;
            Match mt = Regex.Match(tb1, @"_(\w*)*");
            while (mt.Success)
            {
                var item = mt.Value;
                while (item.IndexOf('_') >= 0)
                {
                    string newUpper = item.Substring(item.IndexOf('_'), 2);
                    item = item.Replace(newUpper, newUpper.Trim('_').ToUpper());
                    tb1 = tb1.Replace(newUpper, newUpper.Trim('_').ToUpper());
                }
                mt = mt.NextMatch();
            }

            textBox2.Text = tb1;
        }