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I need to append counter number to files while saving the uploaded files, for example client upload 2 files imagex.jpg, imagey.jpg

I want to save them to server as Client_UPI_1.jpg, Client_UPI_2.jpg

Below is the code i am using

public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider

 string _filename = null;
 public CustomMultipartFormDataStreamProvider(string path,string filename) : base(path) _filename = filename; 

 public override Stream GetStream(HttpContent parent, HttpContentHeaders headers)
 
 Logger.LogMessage(LogType.Debug, "GetStream Start");
 var fileExtension = Path.GetExtension(headers.ContentDisposition.FileName.Replace(""", ""));
 Logger.LogMessage(LogType.Debug, "GetStream complete");
 return base.GetStream(parent, headers);
 

 public override string GetLocalFileName(HttpContentHeaders headers)
 
 ContentDispositionHeaderValue disposition = headers.ContentDisposition;
 string filename = (disposition != null && disposition.FileName != null) ? disposition.FileName : String.Empty;
 string extension = Path.GetExtension(filename.Replace(""", ""));
 return String.Format(CultureInfo.InvariantCulture, "0", (_filename));
 

 

Prepare CustomMultipartFormDataStreamProvider in which our multipart form data will be loaded

string fileUploadPath = Path.Combine(ConfigHelper.FILE_UPLOAD_LOCATION);
int counter = 0;
string filename = "Client_UPI_" + counter + ".jpg"; // NEED TO UPDATE THE COUNTER SO THAT FILE NAME A SEQUENCE NUMBER
CustomMultipartFormDataStreamProvider provider = new CustomMultipartFormDataStreamProvider(fileUploadPath,filename);

var task = request.Content.ReadAsMultipartAsync(provider).
 ContinueWith<HttpResponseMessage>(o =>
 
 //some logic
 
);
return task;

Currently all my filenames save as "Client_UPI_0.jpg", I want to update the counter number based on the sequence of the files, like file1 will be "Client_UPI_1.jpg" and file2 will be "Client_UPI_2.jpg" so on