title: Object reference not set to an instance of an object
body: <p>My asp.net-Mysql application is hosted on windowsserver,when i tried to insert image into mysql table from the admin.aspx page,its displaying the error </p>
  
  <blockquote>
    <p>"Object reference not set to an instance of an object."</p>
  </blockquote>
  
  <p>But from my VS I can insert image to local mysql server without any error.</p>
  
  <p>When i inserted image from webadmin,it is inserted successfully and displaying image on website.I can update the contents through my admin.aspx,but when i tried to update or insert image,I am getting the error.</p>
  
  <pre><code>[NullReferenceException: Object reference not set to an instance of an object.]
     Lavande.DBconnect.addimagehome(Byte[] image, String Content, String arabiccontent) in C:\Users\user\Desktop\Lavande_Asp\Lavande\Lavande\DBconnect.cs:33
     Lavande.abklavande900.button_savehome_Click(Object sender, EventArgs e) in C:\Users\user\Desktop\Lavande_Asp\Lavande\Lavande\abklavande900.aspx.cs:84
     System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118
     System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
     System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
     System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
     System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
     System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563
  </code></pre>
  
  <p>Following is the code to read the uploaded file:</p>
  
  <pre><code> string path = System.IO.Path.GetFullPath(FileUpload_home.PostedFile.FileName);
  Byte[] image = WM.ImageSetting("watermarkname", Server.MapPath("upload/") + "logo1.png", path);
  DB.addimagehome(image, contentsend, arabiccontent);
  </code></pre>
  
  <p>watermarkclass.</p>
  
  <pre><code>public class watermark
  {
      public Byte[] ImageSetting(string wmText, string wmImage, string mainImage)
      {
          byte[] imageBytes = null;
          if (File.Exists(mainImage))
          {
  
              System.Drawing.Image image = System.Drawing.Image.FromFile(mainImage);
  
              Graphics graphic;
              if (image.PixelFormat != PixelFormat.Indexed &amp;&amp; image.PixelFormat != PixelFormat.Format8bppIndexed &amp;&amp; image.PixelFormat != PixelFormat.Format4bppIndexed &amp;&amp; image.PixelFormat != PixelFormat.Format1bppIndexed)
              {
                  // Graphic is not a Indexed (GIF) image
                  graphic = Graphics.FromImage(image);
              }
              else
              {
                  /* Cannot create a graphics object from an indexed (GIF) image.
                   * So we're going to copy the image into a new bitmap so
                   * we can work with it. */
                  Bitmap indexedImage = new Bitmap(image);
                  graphic = Graphics.FromImage(indexedImage);
  
                  // Draw the contents of the original bitmap onto the new bitmap.
                  graphic.DrawImage(image, 0, 0, image.Width, image.Height);
                  image = indexedImage;
              }
              graphic.SmoothingMode = SmoothingMode.AntiAlias &amp; SmoothingMode.HighQuality;
  
              //Text Watermark properties
              Font myFont = new Font("segoe script", 17, FontStyle.Bold);
              SolidBrush brush = new SolidBrush(Color.FromArgb(40, Color.White));
              SizeF textSize = new SizeF();
              if (wmText != "")
                  textSize = graphic.MeasureString(wmText, myFont);
  
              //Image Watermark
              System.Drawing.Image ig = null;
              if (wmImage != "")
                  ig = System.Drawing.Image.FromFile(wmImage);
  
              // Write the text watermark and image watermark across the main image.
              for (int y = 0; y &lt; image.Height; y++)
              {
                  for (int x = 0; x &lt; image.Width; x++)
                  {
                      PointF pointF = new PointF(x, y);
                      PointF pointFm = new PointF(x, y+150);
                      if (wmText != "")
                      {
                          graphic.DrawString(wmText, myFont, brush, pointFm);
                          x += Convert.ToInt32(textSize.Width);
                      }
                      if (wmImage != "")
                      {
                          graphic.DrawImage(ig, pointF);
                          x += Convert.ToInt32(ig.Width);
                      }
                  }
                  if (wmText != "")
                      y += Convert.ToInt32(textSize.Height);
                  if (wmImage != "")
                      y += Convert.ToInt32(ig.Height);
  
              }
  
              using (MemoryStream memoryStream = new MemoryStream())
              {
                  // save image in memoryStream with it format which get it from GetImageFormat function
                  image.Save(memoryStream, GetImageFormat(mainImage));
                  imageBytes = memoryStream.ToArray();
              }
              graphic.Dispose();
          }
  
  
          return imageBytes;
  
  
      }
  
      //function to return Image Format
      ImageFormat GetImageFormat(String path)
      {
          switch (Path.GetExtension(path).ToLower())
          {
              case ".bmp": return ImageFormat.Bmp;
              case ".gif": return ImageFormat.Gif;
              case ".jpg": return ImageFormat.Jpeg;
              case ".png": return ImageFormat.Png;
              default: return null;
          }
      }
  
  }
  </code></pre>
  
  <p>}</p>