Error reading words in the text file - asp.net

Question

I have been working on a code snippet today . A part of the Code reads the number of words in the file.I am using StreamReader to do the same , but it seems to give DirectoryNotFound Exception.Here is the code for the event
protected void Button1_Click(object sender, EventArgs e)
{
string filename = string.Empty;
string FilePath = ConfigurationManager.AppSettings["FilePath"].ToString();
if (FileUpload1.HasFile)
{
string[] Exe = { ".txt" };
string FileExt = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName);
bool isValidFile = Exe.Contains(FileExt);
if (isValidFile)
{
int FileSize = FileUpload1.PostedFile.ContentLength;
if (FileSize <= 102400)
{
filename = Path.GetFileName(FileUpload1.FileName);
FileUpload1.SaveAs(Server.MapPath(FilePath) + filename);
StreamReader sr = new StreamReader(FilePath+filename);
//The error shows up here and i have tried to use FilePath as the single parameter too
int counter = 0;
string delim = " ,.?!";
string[] fields = null;
string line = null;
while (!sr.EndOfStream)
{
line = sr.ReadLine();//each time you read a line you should split it into the words
line.Trim();
fields = line.Split(delim.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
counter += fields.Length; //and just add how many of them there is
}
sr.Close();
lblcount.Text = counter.ToString();
lblMsg.Text = "File upload successfully!";
}
else
{
lblMsg.Text = "File Size allowed upto 100kb!";
}
}
else
{
lblMsg.Text = "Please Upload a text File!";
}
}
else
{
lblMsg.Text = "Please upload a file!";
}
}
}
Can this be sorted out ??
Thanks in Advance!

Answer 1

Use Path.Combine to build paths:
string path = Path.Combine(Server.MapPath(FilePath), filename);
FileUpload1.SaveAs(path);
using(StreamReader sr = new StreamReader(path))
{
// ...
}