Minus 2 value in FastReport.net - fastreport

Question

I want to Minus to value in FastReport.Net in footer.
my Code :
private void PageFooter1_BeforeLayout(object sender, EventArgs e)
{
Text22.Text=Convert.ToString(Convert.ToDouble(Text12.Text)-Convert.ToDouble(Text3.Text));
}
and this error was occurs:
FastReport.Net v1.7.33
Exception has been thrown by the target of an invocation.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.FormatException: Input string was not in a correct format.
at System.Number.ParseDouble(String value, NumberStyles options, NumberFormatInfo numfmt)
at FastReport.ReportScript.PageFooter1_BeforeLayout(Object sender, EventArgs e)
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at FastReport.Code.ExpressionDescriptor.Invoke(Object[] parameters)
at FastReport.BandBase.CalcHeight()
at FastReport.Engine.ReportEngine.ShowBandToPreparedPages(BandBase band, Boolean getData)
at FastReport.Engine.ReportEngine.ShowBand(BandBase band, Boolean getData)
at FastReport.Engine.ReportEngine.EndLastPage()
at FastReport.Engine.ReportEngine.RunReportPage(ReportPage page)
at FastReport.Engine.ReportEngine.RunReportPages()
at FastReport.Engine.ReportEngine.RunReportPages(ReportPage page)
at FastReport.Engine.ReportEngine.Run(Boolean runDialogs, Boolean append, ReportPage page)
at FastReport.Report.Prepare(Boolean append)
at FastReport.Design.ReportTab.Preview()
can anyone help me ?

Answer 1

You can try to do DataTextFormatString="{0:Axx}", and put the code into the BeforePrint event.
For example:
private void Text14_BeforePrint(object sender, EventArgs e)
{
Text14.Text=string.Format("{0:N}",((Decimal)Report.GetColumnValue("Table.money"))-((Decimal)Report.GetColumnValue("Table.TRSMONEY")));
}