getting out of memory exception while using fileStream - asp.net

Question

I am facing an Issue while uploading file from a web page to server. It works fine for files upto 200 MB, but starts throwing out of memory exception.
Could you please help me
I have pasted the code below
private void UploadToServer(HttpPostedFile oHttpPostedFile)
{
string CalCheckSum = string.Empty;
try
{
string FileName = getFileName(oHttpPostedFile.FileName.Trim());
if (File.Exists(Server.MapPath("Upload") + "\\" + System.IO.Path.GetFileName(FileName)))
{
File.Delete(Server.MapPath("Upload") + "\\" + System.IO.Path.GetFileName(FileName));
}
string serverFilePath = Server.MapPath("Upload") + "\\" + System.IO.Path.GetFileName(FileName);
FileStream fs = new FileStream(serverFilePath, FileMode.CreateNew);
string strFileFormName = serverFilePath;
// Uri oUri = new Uri(strUrl);
// DFB: Upload goes into stream
Stream myStream = oHttpPostedFile.InputStream;
string _name = oHttpPostedFile.FileName;
string _contentType = oHttpPostedFile.ContentType;
// DFB: Create buffer for stream
Byte[] myBuffer;
myBuffer = new byte[10240];
if (myStream.Length == 0)
{
//Zero Bytes file Can not be processed
CalCheckSum = string.Empty;
return;
}
else if (myStream.Length > 10240)
myBuffer = new byte[10240];
else
myBuffer = new byte[myStream.Length];
StringBuilder filecontent = new StringBuilder();
int fileLength = (int)myStream.Length;
int length = (int)myStream.Length / myBuffer.Length + 1;
int lastPacketLength = (int)myStream.Length % 10240;
int count = 1;
while (myStream.Read(myBuffer, 0, myBuffer.Length) > 0)
{
if (count == length)
fs.Write(myBuffer, 0, lastPacketLength);
else
fs.Write(myBuffer, 0, myBuffer.Length);
count++;
}
fs.Close();
fs.Dispose();
myStream.Dispose();
myBuffer = null;
myStream = null;
FileStream fileStream = File.OpenRead(serverFilePath);
byte[] pbytCombinedArrays = new byte[fileLength];
int numBytesToRead = fileLength;
int numBytesRead = 0;
while (numBytesToRead > 0)
{
// Read may return anything from 0 to numBytesToRead.
int n = fileStream.Read(pbytCombinedArrays, numBytesRead, numBytesToRead);
// Break when the end of the file is reached.
if (n == 0)
break;
numBytesRead += n;
numBytesToRead -= n;
}
fileStream.Dispose();
fileStream.Close();
}

Answer 1

You get the exception because you are trying to allocate more memory than is allowed for the application. Web applications are generally limited to about 300 MB.
The solution would be to avoid reading the entire file into memory. It's simply too large for a web application to handle all at once.