After clicking on the crop button its showing the error ...i.e Input string was not in a correct format

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XML

<asp:Panel ID="pnlCrop" runat="server" Visible="false">
      <asp:Image ID="imgCrop" runat="server" />
      <br />
      <asp:HiddenField ID="X" runat="server" />
      <asp:HiddenField ID="Y" runat="server" />
      <asp:HiddenField ID="W" runat="server" />
      <asp:HiddenField ID="H" runat="server" />
      <asp:Button ID="btnCrop" runat="server" Text="Crop" OnClick="btnCrop_Click" />
    </asp:Panel>




protected void btnCrop_Click(object sender, EventArgs e)
{
  string ImageName = Session[&amp;amp;quot;WorkingImage&amp;amp;quot;].ToString();
  int w = Convert.ToInt32(W.Value);
  int h = Convert.ToInt32(H.Value);
  int x = Convert.ToInt32(X.Value);
  int y = Convert.ToInt32(Y.Value);

  byte[] CropImage = Crop(path + ImageName, w, h, x, y);
  using (MemoryStream ms = new MemoryStream(CropImage, 0, CropImage.Length))
  {
    ms.Write(CropImage, 0, CropImage.Length);
    using(SD.Image CroppedImage = SD.Image.FromStream(ms, true))
    {
      string SaveTo = path + &amp;amp;quot;crop&amp;amp;quot; + ImageName;
      CroppedImage.Save(SaveTo, CroppedImage.RawFormat);
      pnlCrop.Visible = false;
      pnlCropped.Visible = true;
      imgCropped.ImageUrl = &amp;amp;quot;images/crop&amp;amp;quot; + ImageName;
    }
  }
}

Posted 3-Oct-13 18:52pm

Member 10170389

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**Azee** · Answer 1 · 2013-10-03T19:23:00

Hey there,

It could be one of these lines:

C#

int w = Convert.ToInt32(W.Value);
  int h = Convert.ToInt32(H.Value);
  int x = Convert.ToInt32(X.Value);
  int y = Convert.ToInt32(Y.Value);

This Exception could occur if any of the hidden fields in these statement have empty value and since you have not set a default Int value in these lines:

ASP.NET

<asp:hiddenfield id="X" runat="server"/>
     <asp:hiddenfield id="Y" runat="server"  />
     <asp:hiddenfield id="W" runat="server" />
     <asp:hiddenfield id="H" runat="server"/>

I susspect that this is causing the Exception.
Anyway, either set a default value like e.g,

ASP.NET

<asp:hiddenfield id="Y" runat="server" value="0"  />

or check the Hidden Fields value is not Empty String before Converting them, e.g,

C#

int h = H.Value != string.empty ? Convert.ToInt32(H.Value) : 0;

Hope it helps
Azee...