How can we change the background color of all other forms from one form?

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You can use the (ApplicationSettings) property, accessible from the Form Designer’s Properties panel. Expand ApplicationSettings, open up the PropertyBinding dialog, add a Setting to the BackColor property (e.g., CommonFormBackColor) and use the same setting for all Forms.

You can create the Setting directly in the Application Settings’ PropertyBinding dialog:

Properties Application Settings New

This new Setting is created in the User Scope.
All settings in the User Scope are applied on a per-User basis and can be changed.
Settings in the Application Scope are considered read-only.

Properties Application Settings Add

The new Setting will then appear under the ApplicationSettings expandable property:

Properties Application Settings

Assign the same Setting to all Forms that should change their BackColor when this setting is changed.
You can of course assign a common Setting to any other Property of any other Control.

The use of a Form Template (or a base Form class) can automate the whole process.

When the Setting value is changed at run-time, all opened Forms – and those that will be opened later – will present the same BackColor.

You can set a new value to all Form’s BackColor changing the Settings’s Value:
(all opened Form that share the same Setting for the BackGround Color will change color immediately)

Properties.Settings.Default.CommonFormBackColor = Color.Orange;

You can save the current Settings selection (to preserve the value assigned in the current session, so it will be used again when the application is restarted) with:

Properties.Settings.Default.Save();

You can reset the default value (the value originally assigned to the Settings in the Designer) calling:

Properties.Settings.Default.Reset();

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