How to Pass a String Value from a Child Form to its Parent Form in Windows Forms?

Efficiently Transferring Data from Child to Parent Forms in Windows Forms

This guide demonstrates a straightforward method for passing string data from a child form back to its parent form within a Windows Forms application. This is a common requirement in many applications.

Scenario: A parent form opens a child form (FormOptions) using ShowDialog(). The goal is to retrieve a string value from the child form after it closes. The parent form's initial code might look like this:

<code class="language-csharp">FormOptions formOptions = new FormOptions();
formOptions.ShowDialog();</code>

Solution: The solution involves adding a public property to the child form to hold the string value. The parent form then accesses this property after the child form closes.

Implementation:

Add a public property to your FormOptions class:

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

Within the child form's code, set the ResultString property before closing:

<code class="language-csharp">// ... some code in your child form ...

this.ResultString = "Your String Value Here"; // Set the value before closing
this.Close();</code>

The parent form can then retrieve the value:

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

    string receivedValue = formOptions.ResultString;

    // Use the receivedValue variable...
    MessageBox.Show("Received Value: " + receivedValue);
}</code>

This improved example clearly shows how to set and retrieve a string value, enhancing the clarity and efficiency of data transfer between forms. The using statement ensures proper resource management.

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