protected void setImageWidth() int imageWidth; if (Label1.Text != null) imageWidth = 1 * Convert.ToInt32(Label1.Text); Image1.Width = imageWidth; After to run the page on a browser, I acquire the System.FormatException: intake string was no in a exactly format.

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The trouble is v line

imageWidth = 1 * Convert.ToInt32(Label1.Text);Label1.Text might or might not be int. Check.

Use Int32.TryParse(value, out number) instead. That will fix your problem.

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

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If making use of TextBox2.Text as the resource for a numeric value, that must very first be checked to check out if a worth exists, and also then converted to integer.

If the text box is empty when Convert.ToInt32 is called, girlfriend will get the System.FormatException. Suggest trying:

protected void SetImageWidth() try Image1.Width = Convert.ToInt32(TextBox1.Text); catch(System.FormatException) Image1.Width = 100; // or other default worth as ideal in context.

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Because Label1.Text is holding label which can"t be parsed right into integer, you need to transform the associated textbox"s text to integer

imageWidth = 1 * Convert.ToInt32(TextBox2.Text);
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