How to Pass String Values from Child to Parent Forms in Windows Applications?

Inter-Form Communication in Windows Applications: Passing String Values

Working with multiple forms in a Windows application often necessitates data exchange. This example demonstrates how to efficiently transfer string data from a child form back to its parent.

String Value Transfer Technique

To send a string from a child form (let's call it FormOptions) to its parent, follow these steps:

1. Define a Property (or Method): In the FormOptions class, create a public property (or method) to hold the string value intended for the parent. A property is generally preferred for cleaner code. For example:

<code class="language-csharp">public string GetMyResult { get; set; }</code>

2. Set the Property in the Child Form: Within the child form's code, set the GetMyResult property to the desired string value before closing the form. This might occur after a button click or other relevant event.

3. Retrieve the Value in the Parent Form: In the parent form, after calling formOptions.ShowDialog(), access the GetMyResult property to obtain the string value:

<code class="language-csharp">using (FormOptions formOptions = new FormOptions())
{
    formOptions.ShowDialog();
    string result = formOptions.GetMyResult; 

    // Use the 'result' string as needed...
}</code>

This approach ensures that the parent form receives the string data from the child form after the child's dialog is closed. The retrieved string can then be used for further processing within the parent form's logic.

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