How to collapse or expand the WinForms SplitContainerAdv panels?

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Collapsing a panel

If you assign true to Panel1Collapsed property, then left or top panel will be collapsed and if you assign false to Panel1Collapsed then left or top panel will be expanded. This same behavior is applicable to Panel2Collapsed property.

Following code snippet toggles the collapse and expand behaviour

// Collapse left or top panel and expand right or bottom panel
this.splitContainerAdv1.Panel1Collapsed = true;
this.splitContainerAdv1.Panel2Collapsed =false;
//Collapse right or bottom panel and expand left or top panel
this.splitContainerAdv1.Panel1Collapsed = false;
this.splitContainerAdv1.Panel2Collapsed =true;

'Collapse left or top panel and expand right or bottom panel
Me.splitContainerAdv1.Panel1Collapsed = True
Me.splitContainerAdv1.Panel2Collapsed = False
'Collapse right or bottom panel and expand left or top panel
Me.splitContainerAdv1.Panel1Collapsed = False
Me.splitContainerAdv1.Panel2Collapsed = True

Reference link: https://help.syncfusion.com/windowsforms/splitcontainer/splitcontaineradv#collapsing-a-panel

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How to collapse or expand the WinForms SplitContainerAdv panels?

Collapsing a panel

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