Renaming a File in C#

if (ASPxUploadControl1.HasFile ) or//(Fileupload.Hasfile)
 {
     try
     {
         string extension = Path.GetExtension(ASPxUploadControl1.FileName);
         string id = Guid.NewGuid().ToString();  //here give your username or whatever you want
         string fileLocation = string.Format("{0}/{1}{2}", Server.MapPath("upload/"), id, extension);
         ASPxUploadControl1.SaveAs( fileLocation );
         StatusLabel.Text = "Upload status: File uploaded!";
     }
     catch (Exception ex)
     {
         StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
     }
 }

try this function to upload file

public static string UploadFile(FileUpload File1)
{

Randoms r = new Randoms();
string random = r.Voucher();

string files = "";if (File1.PostedFile != null)
{

string StrFileName = File1.PostedFile.FileName.Substring(File1.PostedFile.FileName.LastIndexOf("\\") + 1);

string StrFileType = File1.PostedFile.ContentType;
int IntFileSize = File1.PostedFile.ContentLength;

if (IntFileSize > 0)
File1.PostedFile.SaveAs(HttpContext.Current.Server.MapPath("Files/" + random + DateTime.UtcNow.DayOfYear.ToString() + StrFileName));

files = (("Files/" + random + DateTime.UtcNow.DayOfYear.ToString() + StrFileName));
}

return files;
}

 

and make a class named  Randoms to change file name when uploading

this is random class

Randoms.cs

=========

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

using System.Text;

using System.IO;

/// <summary>
/// Summary description for Randoms

/// </summary>

public class Randoms

{

private int RandomNumber(int min, int max)
{

Random random = new Random();return random.Next(min, max);
}

protected string RandomString(int size, bool lowerCase)
{

StringBuilder builder = new StringBuilder();

Random random = new Random();
char ch;

for (int i = 0; i < size; i++)
{

ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
builder.Append(ch);

}

if (lowerCase)
return builder.ToString().ToLower();

return builder.ToString();
}

 

protected string RandomString2(int sizes, bool lowerCases)
{

StringBuilder builders = new StringBuilder();
Random randoms = new Random();

char chs;for (int i = 0; i < sizes; i++)
{

chs = Convert.ToChar(Convert.ToInt32(Math.Floor(25 * randoms.NextDouble() + 65)));
builders.Append(chs);

}

if (lowerCases)
return builders.ToString().ToLower();

return builders.ToString();
}

}

 

 

and to call the function

 

 

string filelocation = UploadFile(FileUpload1);

hope this helps