or:

string s = Convert.ToString(num);

string myString = myInt.ToString();

int num = 10;
string str = Convert.ToString(num);

如果你从数据集中

string newbranchcode = (Convert.ToInt32(ds.Tables[0].Rows[0]["MAX(BRANCH_CODE)"]) ).ToString();

以防你想要二进制表示，而你还在昨晚的派对上喝得酩酊大醉:

private static string ByteToString(int value)
{
    StringBuilder builder = new StringBuilder(sizeof(byte) * 8);
    BitArray[] bitArrays = BitConverter.GetBytes(value).Reverse().Select(b => new BitArray(new []{b})).ToArray();
    foreach (bool bit in bitArrays.SelectMany(bitArray => bitArray.Cast<bool>().Reverse()))
    {
        builder.Append(bit ? '1' : '0');
    }
    return builder.ToString();
}

注意:关于不能很好地处理字节顺序……

如果你不介意为了速度而牺牲一点内存，你可以使用下面的方法生成一个预先计算字符串值的数组:

static void OutputIntegerStringRepresentations()
{
    Console.WriteLine("private static string[] integerAsDecimal = new [] {");
    for (int i = int.MinValue; i < int.MaxValue; i++)
    {
        Console.WriteLine("\t\"{0}\",", i);
    }
    Console.WriteLine("\t\"{0}\"", int.MaxValue);
    Console.WriteLine("}");
}

using System.ComponentModel;

TypeConverter converter = TypeDescriptor.GetConverter(typeof(int));
string s = (string)converter.ConvertTo(i, typeof(string));