how to read and write to the file from the system connected through lan

public partial class About : System.Web.UI.Page
{
    public string newcontnt = "";
    public string oldcontent = "";

    protected void Page_Load(object sender, EventArgs e)
    {
        newcontnt = Request.QueryString["newcon"];
        oldcontent = Request.QueryString["oldcon"];

        writetofile(newcontnt, oldcontent);
    }

    private void writetofile(string newcontnt, string oldcontent)
    {

        string text = File.ReadAllText(@"\\192.168.7.103\testdata.txt");
        string textn = newcontnt;
        string texto = oldcontent;
        text = text.Replace(texto, textn);
        File.WriteAllText(@"\\192.168.7.101\testdata.txt", text);
        Response.Redirect("http://localhost/test61.html");

    }
}

in this code its showing network name not found error