How To Send SMS in c# application

http://www.ozekisms.com/mms:xml/mms-settings/video/GoIPsetup/index.php?owpn=315&info=developers-guide/c-sharp-sms-api
https://www.clickatell.com/apis-scripts/scripts/c-scripts/
http://msdn.microsoft.com/en-us/library/aa919102.aspx
http://www.2sms.com/software.aspx?section=CodeCSharp
http://www.vianett.com/en/developers/api-code-examples/c

private void Send_Click(
object sender, System.EventArgs e)
{
try
{
SmsTest.net.webservicex.www.SendSMS smsIndia=
new SmsTest.net.webservicex.www.SendSMS();
SmsTest.com.webservicex.www.SendSMSWorld smsWorld =
new SmsTest.com.webservicex.www.SendSMSWorld();
if(rdoType.SelectedValue == "1")
smsIndia.SendSMSToIndia(txtMobileNo.Text.Trim(),
txtEmailId.Text.Trim(), txtMessage.Text);
else
smsWorld.sendSMS(txtEmailId.Text.Trim(),
txtCountryCode.Text.Trim(), txtMobileNo.Text.Trim(),
txtMessage.Text);
lblMessage.Visible = true;
lblMessage.Text="Message Send Succesfully";
}
catch(Exception ex)
{
lblMessage.Visible = true;
lblMessage.Text="Error in Sending message"+ex.ToString();
}
}

private void rdoType_SelectedIndexChanged(
object sender, System.EventArgs e)
{
if(rdoType.SelectedValue =="1")
txtCountryCode.Enabled = false;
else
txtCountryCode.Enabled = false;

}