从Excel电子表格中读取数据

可能重复：
从Excel文件读取数据

我在阅读C#中的Excel电子表格时遇到了一些问题。我有这个代码，我读取从A到X的每个单元格。

int i = 1;
int number;
System.Array myvalues; string[] strArray;
Microsoft.Office.Interop.Excel.Range range = 
    worksheet.get_Range("A" + i.ToString(), "X" + i.ToString());
while(range.Count!=0)
{
    i++;
    range = worksheet.get_Range("A" + i.ToString(), "X" + i.ToString());
    myvalues = (System.Array)range.Cells.Value;
    strArray = ConvertToStringArray(myvalues);
    number = Convert.ToInt32(strArray[0]);
}

我的问题是：如何根据"数字"值读取excel中接下来的4*"数字"行？

例如：

 A B C D E F G H I J
 a a a a a 1 a a a a 

F的单元格值是1，所以我想读（G H I J）如果F的单元格值为2，我想读取（G H I J K L M N）

 A B C D E F G H I J K L M N
 a a a a a 2 a a a a a a a a

F的单元格值3:

A B C D E F G H I J K L M N O P Q R
a a a a a 3 a a a a a a a a a a a a

if (!number_add_file.Equals("")  )
{
    addcmpy();
    Microsoft.Office.Interop.Excel.Range range_add = worksheet.get_Range("X"+i.ToString() , "AA" + i.ToString());
    while(range_add.Count != 0){
    if (Int32.Parse(number_add_file) == 2)
    {
        range_add = worksheet.get_Range("X"+i.ToString() , "AE"i.ToString() );
    }
    else if (Int32.Parse(number_add_file) == 3)
    {
        range_add = worksheet.get_Range("X"i.ToString() , "AI"i.ToString());
    }
    else if (Int32.Parse(number_add_file) == 4)
    {
        range_add = worksheet.get_Range("X"i.ToString() , "AM"i.ToString());
    }
    else if (Int32.Parse(number_add_file) == 5)
    {
        range_add = worksheet.get_Range("X" i.ToString(), "AQ"i.ToString() );
    }
    System.Array values = (System.Array)range_add.Cells.Value;
    string[] str = ConvertToStringArray(values);
    for (int l = 0; l < str.Length; l++)
        Console.WriteLine(l +"  "+str[l]);
    name = str[0];
    lang_add = str[1];
    price = str[2];
    description = str[3];
    Console.WriteLine(name + "   " + lang_add + "   " + price + "   " + description);
    addfile();
    name = "";
    lang_add = "";
    price = "";
    description = "";
    }
}