The GridView fired event RowEditing which wasn't handled

The GridView fired event RowEditing which wasn't handled

using System;  using System.Collections.Generic;  using System.Configuration;  using System.Data;  using System.Data.SqlClient;  using System.IO;  using System.Linq;  using System.Web;  using System.Web.UI;  using System.Web.UI.WebControls;    namespace AppManagementConsole  {      public partial class _Default : Page      {          string BuildUploadPath = ConfigurationManager.AppSettings["DirectoryPath"] + "Files/";          string ReleaseNotesUpPath = ConfigurationManager.AppSettings["DirectoryPath"] + "ReleaseNotes/";        protected void Page_Load(object sender, EventArgs e)      {          cpBuildDate.SelectedDate = DateTime.Now;          getBuildData();      }        public void getBuildData()      {          //Select Build List          SqlCommand selectCommand = new SqlCommand("Select * from tblBuildList");            try          {              //Connect to DB              using (SqlConnection conRDB = new SqlConnection(ConfigurationManager.ConnectionStrings["conRDB"].ConnectionString))              {                  SqlDataAdapter selectAdapater = new SqlDataAdapter(selectCommand.CommandText, conRDB);                    DataSet dsBuilds = new DataSet();                  selectAdapater.Fill(dsBuilds);                    //Populate Webpage GV                  gvDataBind(dsBuilds);              }          }            catch (Exception ex)          {          }      }          public void gvDataBind(DataSet dsBuilds)      {          gvBuildList.Dispose();          gvBuildList.DataSource = dsBuilds;          gvBuildList.DataBind();      }        protected void gvBuildList_RowEditing(object sender, GridViewEditEventArgs e)      {          gvBuildList.PageIndex = e.NewEditIndex;          //Bind data to the GridView control.          getBuildData();      }        protected void btnSubmit_Click(object sender, EventArgs e)      {          //Upload Files          UploadFiles();            //Update SQL Table          AddBuildInfo(txtProduct.Text, txtPlatform.Text, cpBuildDate.SelectedDate, txtPublisher.Text, txtVersion.Text, BuildUploadPath,FileUpBuild.FileName, ReleaseNotesUpPath, FileUpRelease.FileName, txtComments.Text);      }        private void UploadFiles()      {          #region Build          string tempfileDir = @"C:\Publish\TempFileStorage\";          if (FileUpBuild.HasFile)          {              try              {                  if (!Directory.Exists(tempfileDir))                  {                      Directory.CreateDirectory(tempfileDir);                  }                  FileUpBuild.SaveAs(@"C:\Publish\TempFileStorage\" + FileUpBuild.FileName);                  FTP.FtpUpload(BuildUploadPath, FileUpBuild.FileName, tempfileDir + FileUpBuild.FileName);                  //FileUpBuild.SaveAs();                  //FileUpBuild.FileContent();              }              catch (Exception ex)              {              }              finally              {                  File.Delete(@"C:\Publish\TempFileStorage\" + FileUpBuild.FileName);              }          }