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Repeat header based on user choice

I have a report subreport with a group and the option "Repeat group header in each page" checked. But I need the user to be able to choose whether or not to show the group header on every page, or just the first time the group appears.
I set up a checkbox to let them choose, but how can I use this to tell the report not to repeat the header during run time?
Update
Beeing a Subreport I can not know which page will appear for the first time and I can not restart the numbering because it is necessary for the report.
I'm using CrystalReports in VS2005 and coding C# in VS2010, I'm working for a company and can't upgrade.
I'm trying to use a FormulaFieldDefinition in C# but I don't know how.

This could be done with a variable inside the sub-report.
Create a formula-field with following content and place it somewhere in the detail-section:
WhilePrintingRecords;
booleanVar headerPrinted := True;
In the suppresion-formula of the group-header place the following code:
WhilePrintingRecords;
booleanVar headerPrinted;
The formula will set the variable to True as soon as the first detail is being printed.
So the suppression formula evaluates to False only the first time the group header is being printed and to True on every subsequent time.
So with a boolean parameter {?GroupHeader} to choose if the header should be printed or not the suppression-formula would look as follows:
WhilePrintingRecords;
booleanVar headerPrinted;
If {?GroupHeader} And headerPrinted Then
True
Else
False
{?GroupHeader} = True would mean: Only show group-headers once.

I'm not sure which version of Crystal Reports you are using, but it does not look like there is an ability to specify a formula for "Repeat Group Header on each Page" under the Group Expert in Crystal 2011.
Instead, you might have to do a work around:
Create a boolean parameter {?GroupHeader} where true means "show the group header on every page."
Create a page header.
Copy your group header elements into the new page header.
Create a suppression formula on the new page header section under the Section Expert.
if PageNumber > 1 and {?GroupHeader} = true then false else true.

How to Supress Blank Space In Crystal report

I have Crystal Repot Like this :
In this I dynamically Supress Field as I I found Null value for that field,
But In Report It shows Blank Space Like here I am Hiding, tag0 ,tag1, tag11, value0 ,value1 ,value11 etc
So Report Shows Like this
I want to Remove this blank Space between Field, above and Below I try
Section Expert => And Tick On Suppress Blank Section , but its not Working
As per Siva Suggest me i Can not Put All the tag in Different Section Because there are in Group Section not in Details
Here Field TAG 0 to 11 and Value 0 to 11 are Variables , which may be hidden or Visible Depend on User Selection , where other Field are static

Try the following step
= > Open your section expert (right click on some white space, you should see it come up).
= > Go to the options for the group footer and turn on reset page numbers after. You should see the page numbers reset at the beginning of each report.
= > Also in the section expert, go to the options for the page header and click on the blue button next to the Suppress (No Drill-Down) option.
= > In the Formula Editor, enter PageNumber=1

I would suggest you to place one tag in one details section like
tag1 in detaila
tag2 in detailb and so on
Then supress the section insetad of supressing the individual fields then you won't get this blank space.

Right Click on the section >> Section Expert >> Check Suppress Blank Section

How to change textbox text dynamically in Crystal Reports using a formula

I just trying to change textbox text dynamically in Crystal Reports using a formula but I did not find where should I put the formula?
Shalini Khare

On crystal report , you can find FormulaFeild section. Right click that and add new formula and apply your logic
EDIT

Instead of textbox write a formula and place the formula in the textbox place.

Step 1-Insert textbox
Step 2- On crystal report ,Open Formula field section. Right click that and add new formula.
Step 3- Give name of Your formula and click OK
Step 4- Write down formula to change textbox text dynamically Like
If{Table.TotalMarks}>400 then "Pass"
Else "Fail"
Step 5- Save and Close
Step 6- Drag this formula from Formula Field and drop it into textbox
Step 7- Now execute your program

Step 1- Insert two Text box (At same place)
Step 2- Write Pass in first textbox and fail to another
Step 3- Right Click On First textbox
Step 4- Select format object
Step 5 Check On Suppress checkbox
Step 6 Open Suppress formula editor and put your formula like
if {Table.TotalMarks}> 400 then
true
else
false
Step 7 Save and close
Step 8-Apply same for second textbox (change formula)
Step 9 Now execute your program

Programmatically hide text/lines in a Crystal Report

I have a Crystal Report that I populate before displaying to the user using a CrystalReportViewer.
I have some static text items and line segments that I would like to show and hide programatically depending on conditions in the business logic. Is there a way I can group a bunch of these items together and hide them as a group?
At the moment, my other option is to have two separate reports that are identical except for these superficial differences.

By all means, please don't create two separate reports :)
In the Report Design view, you should be able to create sub-sections of your detail section (assuming you're talking about the detail section), right-clicking on the Detail section and selecting "Insert Section Below".
You should now have "Details a" and "Details b" sections. You can put your text in the "Details b" section, and apply a conditional suppression formula to it.
To conditionally suppress the "Details b" section, right-click on it in the Design View, select "Format section...", click on the button next to the "Suppress" checkbox, and add your formula there.

Do the following steps :
1-Add the required field to the report canvas
2-Right click on the field
3-Select the Format Field menu option
4-On the Common Tab in the Format Editor dialog box, press the Conditional Format button [x+2] button for the Display String option
5-In the Formula Workshop enter the following formula:
if {Tablename.Fieldname}= True then Totext(CurrentFieldValue)
else Totext((CurrentFieldValue)) + " Outstanding"
6-Press the [Save & Close] button
7-Press the OK button of the Format Editor dialog box

How to display 20 records on every page of crystal report?

I am new to crystal reports and I need to print 20 rows of data per page.
I found this on the web but it is not working on my system.
if Remainder(Recordnumber,20)=0 then true else false
My system only prints a row per page.

To show 20 records per page do the following
Open the report in Design View
Right click on the Details section and select Section Expert
Make sure the Details section is selected in the Section Expert dialog box. Check the box that says “New Page After”
Click the formula editor button to the right of the checkbox.
Enter the following formula
if Remainder (RecordNumber, 20) = 0 then true else false
Click Save and Close and then click OK.

To make it show 10 records per page do the following
Open the report in Design View
Right click on the Details section and select Section Expert
Make sure the Details section is selected in the Section Expert dialog box. Check the box that says “New Page After”
Click the formula editor button to the right of the checkbox.
Enter the following formula
if Remainder (RecordNumber, 10) = 0 then true else false
Click Save and Close and then click OK.
If you run the report it should break after each 10 rows.

Could it be something pedantic as RecordNumber is Recordnumber in your code?
if Remainder (RecordNumber, 20) = 0 then true else false

If you are using Crystal reports 2008/2011 there is a new options in the details section properties in the section expert - 'New page after: X Visible Records':