Home/ Questions/Simple way to fix the ''system.formatexception: 'input string was not in a correct format.'''?
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jaylonconroy
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Asked: 2022-07-24T04:53:56+00:00 In:

Simple way to fix the ”system.formatexception: ‘input string was not in a correct format.”’?

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I’m new to C#, and I know the basic knowledge of Java, but I can’t get this code to work.

After running the page on a browser, I get the ”system.formatexception: ‘input string was not in a correct format.”’ error.

The following is what I tried:

MarkUP:

<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

   <asp:Label ID="Label1" runat="server" AssociatedControlID="TextBox2" Text="Label"></asp:Label>

   <asp:SliderExtender ID="SliderExtender1" TargetControlID="TextBox2" BoundControlID="Label1" Maximum="200" Minimum="100" runat="server">
   </asp:SliderExtender>

Code Behind:

protected void setImageWidth()
{
    int imageWidth;
    if (Label1.Text != null)
    {
        imageWidth = 1 * Convert.ToInt32(Label1.Text);
        Image1.Width = imageWidth;
    }
}

I still get this error. Can someone give me some solutions.

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1 Answer

  1. Best Answer
    Expert

    The cause: The error indicates that there isn’t a valid integer in the string you’re attempting to parse for an integer.

    And the problem is with line

    imageWidth = 1 * Convert.ToInt32(Label1.Text);

    Label1.Text could either be int or not.

    Solution: You can fix this error by using Int32.TryParse(value, out number) instead.

    int imageWidth;
if(Int32.TryParse(Label1.Text, out imageWidth))
{
    Image1.Width= imageWidth;
}
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