You can use the int.TryParse to parse a string in to numbers . The function returns true if it suceeds in parsing the string to integer and false if it doesn’t.
using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using System.Windows.Forms; namespace WindowsFormsApplication1 { static class Program { static void Main() { data(); } static void data() { // // Parsing with TryParse // string txtData = "87"; int res; bool result = int.TryParse(txtData, out res); if (result == false) { MessageBox.Show("Invalid Number"); } } } }
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