Upload File/Image in WPF, Win Forms

uploadImage.cs

private void btnBrowse_Click_1(object sender, EventArgs e)
		{
			OpenFileDialog openFile = new OpenFileDialog();
			openFile.Filter = "Images only. | *.jpg; *.jpeg; *.png; *.gif;";

			DialogResult dialogResult = openFile.ShowDialog();
			Image img = Image.FromFile(openFile.FileName);

			
			
			// assign safe name for saving
			string imgSafeName = openFile.SafeFileName;

			// give generic banner name so only one file exists at a time
			string[] nameArray = imgSafeName.Split('.');
			string imgTempName = nameArray[0];
			string extension = nameArray[1];
			imgTempName = "BannerAd";

			string pngString = imgTempName + ".png";

			// get debug folder path
			string appPath = Path.GetDirectoryName(Application.ExecutablePath) + @"\Ads\";

			// check if file path exits
			if (!Directory.Exists(appPath))
			{
				Directory.CreateDirectory(appPath);
			}

			// if file exists, delete existing banner ad
			if (File.Exists(appPath + imgSafeName))
			{
				File.Delete(appPath + imgSafeName);
			}

			// save new banner ad
			File.Copy(openFile.FileName, appPath + imgSafeName);

			// If the file was not a png, reopen file and save it as a png
			if (!extension.Equals("png"))
			{
				// resave as png
				System.Drawing.Image bannerImg = System.Drawing.Image.FromFile(appPath + imgSafeName);
				bannerImg.Save(appPath + pngString, System.Drawing.Imaging.ImageFormat.Png);
			}

			// resize png image for display 
			Image imgPng = Image.FromFile(appPath + pngString);
			imgPng = Helper.ResizeImage(imgPng, 500);

			picAdBanner.Image = imgPng;
			btnDeleteImage.Visible = true;
			btnBrowse.Visible = false;
			lblImgStatus.Text = "Image uploaded successfully";
		}


// Resize image
public static System.Drawing.Image ResizeImage(System.Drawing.Image image, int height)
		{
			System.Drawing.Image newImage;

			if (image.Width > 1000)
			{
				newImage = new Bitmap(1000, height);
			}
			else
			{
				newImage = new Bitmap(image.Width, height);
			}
			

			using (Graphics GFX = Graphics.FromImage((Bitmap)newImage))
			{
				if (image.Width > 1000)
				{
					GFX.DrawImage(image, new Rectangle(0, 0, 1000, height));
				}
				else
				{
					GFX.DrawImage(image, new Rectangle(0, 0, image.Width, height));
				}
				
			}
			return newImage;
		}