Need help in the Windows Application SMS Function in C#

Question

Sir,

I need your help to set a SMS sending function in c#.

WebClient client = new WebClient();
string no, msg;
no = textBoxNo.Text;
msg = textBoxMSg.Text;
string baseUrl = "http://www.businesssms.co.in/[email protected]&Pwd=9995338485&PhNo=919995338485&Text=This is to Inform you that The sms sending function is in Progress&ScheduleAt=";
client.OpenRead(baseUrl);
MessageBox.Show("Sucessfully Send");

How can I assign variable into the Phone number and text in the above link?