private void btnReadSMS_Click(object sender, EventArgs e)
{
try
{
//count SMS

int uCountSMS = objclsSMS.CountSMSmessages(this.port);
if (uCountSMS > 0)
{
#region Command
string strCommand = "AT+CMGL=\"ALL\"";
#endregion

// If SMS exist then read SMS
#region Read SMS
//.............................................. Read all SMS ....................................................
objShortMessageCollection = objclsSMS.ReadSMS(this.port, strCommand);
foreach (ShortMessage msg in objShortMessageCollection)
{

ListViewItem item = new ListViewItem(new string[] { msg.Index, msg.Sent, msg.Sender, msg.Message });
item.Tag = msg;
lvwMessages.Items.Add(item);

}
#endregion

}
else
{
lvwMessages.Clear();
//MessageBox.Show("There is no message in SIM");
this.statusBar1.Text = "There is no message in SIM";

}
}
catch (Exception ex)
{
ErrorLog(ex.Message);
}
}

#region Count SMS
public int CountSMSmessages(SerialPort port)
{
int CountTotalMessages = 0;
try
{

#region Execute Command

string recievedData = ExecCommand(port, "AT", 300, "No phone connected at ");
recievedData = ExecCommand(port, "AT+CMGF=1", 300, "Failed to set message format.");
String command = "AT+CPMS?";
recievedData = ExecCommand(port, command, 1000, "Failed to count SMS message");
int uReceivedDataLength = recievedData.Length;

#endregion

#region If command is executed successfully
if ((recievedData.Length >= 45) && (recievedData.StartsWith(command )))
{

#region Parsing SMS
string[] strSplit = recievedData.Split(',');
string strMessageStorageArea1 = strSplit[0]; //SM
string strMessageExist1 = strSplit[1]; //Msgs exist in SM
#endregion

#region Count Total Number of SMS In SIM
CountTotalMessages = Convert.ToInt32(strMessageExist1);
#endregion

}
#endregion

#region If command is not executed successfully
else if (recievedData.Contains("ERROR"))
{

#region Error in Counting total number of SMS
string recievedError = recievedData;
recievedError = recievedError.Trim();
recievedData = "Following error occured while counting the message" + recievedError;
#endregion

}
#endregion

return CountTotalMessages;

}
catch (Exception ex)
{
throw ex;
}

}
#endregion