txt文件读取和写入(.net)

//检查文件,如果文件不存在则创建
private void ExistsFile(string FilePath)
{
if(!File.Exists(FilePath))
File.Create(FilePath);
}

private void Button2_Click(object sender, System.EventArgs e)
{
ExistsFile(Server.MapPath("test/weather.txt"));//检查文件是否存在
//读取文件
StreamReader sr = new StreamReader(Server.MapPath("test/weather.txt"), System.Text.Encoding.Default);
try
{
string input = sr.ReadToEnd();
sr.Close();
input = input.Replace("/r/n", "").Replace("/n", "");
this.TextBox1.Text = input;
}
catch
{
Response.Write("<script>alert('文件读取失败');</script>");
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
ExistsFile(Server.MapPath("test/weather.txt"));//检查文件是否存在
//写入文件
StreamWriter sr = new StreamWriter(Server.MapPath("test/weather.txt"),false,System.Text.Encoding.Default);
try
{
sr.Write(this.TextBox1.Text);
sr.Close();
Response.Write("<script>alert('文件写入成功');</script>");
}
catch
{
Response.Write("<script>alert('文件写入失败');</script>");
}
}