File Upload- Creating Folder If It Does Not Exist?

I have a current file upload that works but I have to make sure that the SupplierImage folder is created. I would like for the upload to create the folder if the folder does not exist. Here is my code

protected void btnUpload2_Click(object sender, EventArgs e)
{
try
{
string path = "~\Assets\ApplicationCompany\SupplierImage\" + ddlVendor2.SelectedValue.ToString() + ".jpg"));
Label1.Text = "Received " + FileUpload2.FileName;
}
else
{
Label1.Text = "You have not selected a valid upload file. GIFs only";
}
}
catch (Exception)
{
throw;
}
}