How to use TryParse

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C#

Sorry for posting something similar to my older post. But the answer for the old one suggested to use regex. However I want to learn how to do it using TryParse. So here is the code:

private void InputBox_TextChanged(object sender, EventArgs e)
        {
            if (InputBox.Text.StartsWith("π") == false)//Clear the box if the message does not start with π
            {
                InputBox.Text = "";
            }
            if ((InputBox.Text.StartsWith("π") == true) && (InputBox.Text.EndsWith("}") == true))// only process if the message starts with π and ends with }
            {
                string Message = InputBox.Text;
                InputBox.Text = "";// Clear the box when done. 
                if (Message.StartsWith("πImageBox_Coordinates{") == true) ///Coordinates
                {
                    Message = Message.Substring(22);
                    Message = Message.TrimEnd('}');      
                    string[] MessageSplit = Message.Split(new char[] { ',' });           
                    for (int i = 0; i < MessageSplit.Count(); i++)
                    {
                        buttcorrs[i] = Convert.ToInt16(MessageSplit[i]);
                        //////////////////////
                    }

What I am trying is I am getting a string through inputbox by pressing buttons and it sends me hardcoded string such as {123,344,456,456} however when i press morethan one button the string gets screwed and sends weird characters. When I get the string the way i want to I trim it and send it to an array so each number becomes a index for buttcorrs array above example it becomes: buttcorrs[0] = 123, buttcorrs[1] = 344 and so on. So when i get weird characters the program crashes. Some how I need to check the string before I trim it and make sure it only contains numbers. I couldn't make regex work and want to try, tryParse. but cant figure that out too.

So if someone can teach me how to use tryParse I will appreciate it.

Thank you,