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[Crusoe]

The old IsNumeric function is still available in .NET

Add a reference to Microst.Visualbasic and use the Information.IsNumeric function.

e.g.

using Microsoft.VisualBasic;

    private void button1_Click(object sender, EventArgs e) {
      string s = "1";
      if (Information.IsNumeric(s)) {
        MessageBox.Show("yes it's a number");
      }   
    }

P.S. I know this is a 7 year old thread, but, this page is the first one that appears if you Google for C# IsNumeric and it does not have a correct answer. Just trying to fight pollution of the internet.

[JBobbins]

This seems to work well:

public static bool IsNumeric(object o)
{
	double result;
	return o != null && Double.TryParse(o.ToString(), out result);
}

[daniefvh]

int test = 0;
if (!int.TryParse(Position,test))
{
// Is a Number
}
else {
// Not a number
}