c# Problem with webbrowser.document.Innertext

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C#

I have the following code. When Browser loads first time, the function Function() is loaded and It finds "variable", but when the browser loads second time, funtion() is loaded but it doesnt find "variable" but I have checked the html and the variable exists. Anyone knows why is that?

  void Browser_DocumentCompleted(object sender, EventArgs e)
        {
Function();
}

Function()
{
            string document= Browser.Document.Body.InnerHtml;
            
            string regex1 = @"(?<=label:</td><td></td><td>)\d{2,3}";
            
            int variable= 0;
            double variable1= 0;
           
            foreach (Match zx in Regex.Matches(document, regex1))
            {

                variable= zx.Value;
               
                MessageBox.Show(variable);

            }
}