hi, anyone know how to fix the inputs in a textbox must be a number ?

Edited 5 Years Ago by leo88: n/a

try
            {
                string Beta = beta.Text; // textbox1 name
                string[] betaLine = beta.Lines;
                double bt = Double.Parse(Beta);
                string least = LS.Text;//textbox 2 name
                double ls = Double.Parse(least);
                
                foreach (string item in betaLine)
                {
                    beta1.Text = item;
                }
                string Ls = LS.Text;
                string[] LSLine = LS.Lines;
                foreach (string items in LSLine)
                {
                    LS1.Text = items;
                }

                if( bt<0 || bt>1)
                {
                    MessageBox.Show("Beta must between 0 and 1");
                }

                if (ls <0 || ls >100)
                {
                    MessageBox.Show("Least Support must between 0 and 100");
                }

                //how to do so that specify the text box inputs must be number (either int or double)??

               
            }
            catch (Exception)
            {
                MessageBox.Show("Must input both field !!\n Beta and LS must be number.");
            }
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