C# .net upload large image file

Using File Upload control on a WebForm to upload a ~6Mb jpg.  Get error:

[HttpException (0x80004005): Maximum request length exceeded.]
   System.Web.HttpRequest.GetEntireRawContent() +9693899
   System.Web.HttpRequest.GetMultipartContent() +63
   System.Web.HttpRequest.FillInFormCollection() +165
   System.Web.HttpRequest.EnsureForm() +75
   System.Web.HttpRequest.get_Form() +12
   System.Web.HttpRequest.get_HasForm() +9695295
   System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +95
   System.Web.UI.Page.DeterminePostBackMode() +69
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +130


I have changed the web config to:

<system.web>
    <httpRuntime executionTimeout="100000" maxRequestLength="214748364" />
  </system.web>
  <system.webServer>
   <security>
      <requestFiltering>
         <requestLimits maxAllowedContentLength="214748364" />
      </requestFiltering>
   </security>
 </system.webServer>

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and this is how the file is read:

int fileLength = uploadedFile.ContentLength;
byte[] buffer = new byte[fileLength];
uploadedFile.InputStream.Read(buffer, 0, fileLength);
string base64String = Convert.ToBase64String(buffer, 0, buffer.Length);
Image im = new Image();
im.ImageUrl = "data:image/png;base64," + base64String;

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