生成随机数
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/// <summary>
/// 生成0-9随机数
/// </summary>
/// <param name="VcodeNum">生成长度</param>
/// <returns></returns>
public static string RndNum(int VcodeNum)
{
StringBuilder sb = new StringBuilder(VcodeNum);
Random rand = new Random();
for (int i = 1; i < VcodeNum + 1; i++)
{
int t = rand.Next(9);
sb.AppendFormat("{0}", t);
}
return sb.ToString();
}