Numeric or not

Question

How to check a field ..whether is it numberic or not. in Visaul Stdio2005 C#

Solitaire · Answer

There is no IsNumeric() function in C#. It is VB only. You will have to write your own method to code an equivalent, as suggested above. The following emulates the Val() function of VB. It returns the numeric value of a string up to the first non-numeric character. Otherwise it returns 0. It works with positive or negative numbers and will accept a single decimal point. However, you will probably prefer a bool method to emulate IsNumeric(). public static double Valcs( string snum) { double vnum = 0; int N; snum = snum.Replace(" ", ""); N = snum.Length; string [] anum = new string [N + 1]; for ( int x = 1; x { anum[x] = snum.Substring(0, x); try { vnum = Convert.ToDouble(anum[x]); } catch { if (x != 0 && anum[x] != "-") break ; } } return vnum; }

raihan68 · Answer

Just make a function to check the field numeric or not. Something like the following: protected bool IsNumeric(string s) { try { Int32.Parse(s); } catch { return false; } return true; } Then use the function : if IsNumeric(textBox1.Text) { //write your code }

Numeric or not

Answers (2)