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using System.Text.RegularExpressions;
Regex reg = new Regex(@"^\d+$"); //ÑéÖ¤×Ö·û´®
Response.Write( reg.IsMatch(""));
Response.Write(reg.IsMatch("sf"));
Response.Write(reg.IsMatch("111a1"));
Response.Write(reg.IsMatch("3333333333"));
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