Hi

This is my code

private void bSend_Click(object sender, EventArgs e)
{
if (tbUrl.Text.Trim().Length == 0)
{
MessageBox.Show("Please specify MMSC url.");
return;
}

string filePath = Path.Combine(GetCurrentDirectory(), tbMMSFilePath.Text);
if (!File.Exists(filePath))
{
MessageBox ...