Programmatically change state of header checkbox (Winforms SfDataGrid)

Question

Hello,I need to be able to change the state (checked or unchecked) of the checkbox in the header of a checkbox column in SfDataGrid programmatically based on conditions outside of the SfDataGrid control.I've come across several other forum posts:https://www.syncfusion.com/forums/55627/how-to-programatically-check-uncheck-checkbox-in-header-columnhttps://www.syncfusion.com/forums/125104/how-to-do-checkbox-in-sfdatagrid-header-or-group-headerhttps://www.syncfusion.com/forums/141254/how-to-set-the-checkbox-in-the-sfdatagrid-header-to-on-after-initial-loading...but none of these do what I desire. Is there a way to do this functionality?Thanks.

Mohanram Anbukkarasu · Accepted Answer

Hi Brent, 

Thanks for contacting Syncfusion support.  

We have prepared a simple sample to achieve your requirement to check/uncheck the checkbox in the header cell of the GridCheckBoxColumn in a button click event. 

Sample link : https://www.syncfusion.com/downloads/support/forum/159820/ze/GridCheckBoxColumn_Demo1041089222  

Please have a look at this sample and let us know if you require further assistance from us.  

Regards, 
Mohanram A.

Stoked · Answer

This is perfect. All I needed was this line here:

(this.sfDataGrid1.Columns["IsClosed"] as GridCheckBoxColumn).GetType().GetProperty("HeaderState", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).SetValue(this.sfDataGrid1.Columns["IsClosed"] as GridCheckBoxColumn, CheckState.Unchecked);

I will test in the near future, and if I have any issues I will respond to this thread.

Thank you.

Mohanram Anbukkarasu · Answer

Hi Brent, 

Thanks for the update.  

We will wait to hear from you.  

Regards, 
Mohanram A.