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Changed in real-time when the child form is changed?...or only <b>AFTER</b> the child form is closed? &nbsp;For the latter, you'd typically set the DialogResult of the child form to indicate success/failure. &nbsp;Then, in the parent form, you'd check the result returned by ShowDialog() and access a <b>Public Property</b> of the child form that exposes the value to be retrieved. &nbsp;This way the child form doesn't need any knowledge of the parent form...everything is done from the parent side.
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Changed in real-time when the child form is changed?...or only AFTER the child form is closed?  For the latter, you'd typically set the DialogResult of the child form to indicate success/failure.  Then, in the parent form, you'd check the result returned by ShowDialog() and access a Public Property of the child form that exposes the value to be retrieved.  This way the child form doesn't need any knowledge of the parent form...everything is done from the parent side.

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To Mike Tomlinson, but what to for &quot;Changed in real-time when the child form is changed?&quot;?
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To Mike Tomlinson, but what to for "Changed in real-time when the child form is changed?"?

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I have a dialog form opened from main form and I need a textbox text in a main form to be changed after changing a text in a dialog form
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I have a dialog form opened from main form and I need a textbox text in a main form to be changed after changing a text in a dialog form

C# parent child form

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).