>Hi,
>
>I got some code off this page:
>
>http://www.aspnettutorials.com/tutorials/network/net-fileupload-aspnet2-csharp.aspx
>
>to allow a user to upload a file from a web page using the FileUpload control in ASP.NET.
>
>Here's the code:
>
>

            if (this.uplLogo.HasFile)
>            {
>                string filepath = this.uplLogo.PostedFile.FileName;
>                string pat = @"\\(?:.+)\\(.+)\.(.+)";
>                Regex r = new Regex(pat);
>                //run
>                Match m = r.Match(filepath);
>                string file_ext = m.Groups[2].Captures[0].ToString();
>                string filename = m.Groups[1].Captures[0].ToString();
>                string file = filename + "." + file_ext;
>
>                //save the file to the server 
>                this.uplLogo.PostedFile.SaveAs(Server.MapPath(".\\") + file);
>                
>                //lblStatus.Text = "File Saved to: " + Server.MapPath(".\\") + file; if (Session["LogoFile"] != null)
>                oAppSettings.LogoFile = file;
>            }

>
>I am getting an error at this line:
>
>

string file_ext = m.Groups[2].Captures[0].ToString();

>
>and the error is:
>
>System.ArgumentOutOfRangeException was unhandled by user code
> Message="Specified argument was out of the range of valid values.\r\nParameter name: i"
> Source="System"
> ParamName="i"
> StackTrace:
> at System.Text.RegularExpressions.CaptureCollection.GetCapture(Int32 i)
> at System.Text.RegularExpressions.CaptureCollection.get_Item(Int32 i)
> at SamaanSystems.IAS.Web.SettingsManager.btnSave_Click(Object sender, EventArgs e) in C:\Development\Mere Mortals .NET Framework 2008\SamaanSystems\IAS.Web\Admin\SettingsManager.aspx.cs:line 51
> at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
> at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
> at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
> at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
> at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
> at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
> InnerException:
>
>I am guessing that m.Groups[2] does not exist, but this is my first time using regular expressions. The file I am trying to upload is this:
>
>"C:\Documents\Arrive Alive\images\AALogo.jpg"
>
>Any idea what I need to do to fix this?

Frank,


You need to test for m.Success

			string filepath = @"\folder\aaa.bb";
			//string filepath = @"\aaa.bb"; // fails

			string pat = @"\\(?:.+)\\(.+)\.(.+)";


			

			var m = Regex.Match(filepath, pat);

			if (m.Success)
			{
				Console.WriteLine("{0}", m.Groups[1].Captures[0].ToString());
				Console.WriteLine("{0}", m.Groups[2].Captures[0].ToString());
			}
			else
				Console.WriteLine("No match");


			Console.ReadLine();