c#冒泡程序用到public class的时候，怎么返回整个数组？

我用的vs2012，代码如下，可能还会有其他问题。。。

    ///下面是自定义类
        public class paopao

{
public int[] strToInt(string[] arr)
{
int[] output = new int[arr.Length];
for (int i = 0; i < arr.Length; i++)
{
output[i] = int.Parse(arr[i]);
}
return output;
}

public int maopao(int[] arr)
{
    for (int i = 0; i < arr.Length - 1; i++)
    {
        if (arr[i] > arr[i + 1])
        {
            int k = arr[i];
            arr[i] = arr[i + 1];
            arr[i + 1] = k;
        }
    }

///此处缺少return语句，需要return冒泡排序后的数组，不知道怎么弄

///下为主程序
public partial class paixv : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void maopao_Click(object sender, EventArgs e)
{
    string strArr = shuzu.Text;
    string[] strarr = strArr.Split(',');
    paopao arr = new paopao();
    int[] intArr = arr.strToInt(strarr);

///上面那一句也有报过错，现在不知道对不对
result.Text = "result:" + arr.ToString();

}

}

}

 public class paopao
{
public int[] strToInt(string[] arr)
{
return arr.Select(x => int.Parse(x)).ToArray();
}

public int[] maopao(int[] arr1)
{
    int[] arr = arr1.ToArray();
        for (int j = 0; j < arr.Length - 1; j++)
        {
    for (int i = j; i < arr.Length - 1; i++)
    {
        if (arr[i] > arr[i + 1])
        {
            int k = arr[i];
            arr[i] = arr[i + 1];
            arr[i + 1] = k;
        }
    }
        }
        return arr;
}

调用

string strArr = shuzu.Text;
    string[] strarr = strArr.Split(',');
    paopao arr = new paopao();
    int[] intArr = arr.strToInt(strarr);
int[] result = arr,maopao(intArr);
result.Text = "result:" + string.Join("," , result.Select(x => x.ToString()));