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private void button3_Click_1(object sender, EventArgs e)
{
string FileName = @"C:\Documents and Settings\l\桌面"+"\\wb.txt";
FileStream filestream = new FileStream(FileName, FileMode.Append , FileAccess.Write);
DataRow row = datable.Rows[0];
StreamWriter sw = new StreamWriter(FileName);
sw.WriteLine(row[1].ToString());
sw.Close();
}