How to Modify Controls in One Windows Form Based on Another Form's Selection?

Data interaction between windows: Modify the control value according to the selection of another window

How to change the control value in a window based on the choice of another window? For example, when the combination box in Form 1 needs to fill the data according to the lines selected in the data grid in Form 2, this problem will occur.

Solution:

In C#, the data communication between the windows is similar to the interaction between the class. Here are several methods to achieve this goal:

Operation FORM 2 in Form 1:

Set parameters in the constructor of Form 2: Create an instance of Form 2 and pass the required value as the parameter.

Create public attributes or methods in Form 2: configure the required attributes or methods in Form 2, and visit them from Form 1.

• Public the Form 2 control to the public: allow Form 1 to directly access specific controls in Form 2.
Operation Form 1 in Form 2:

Pass the instance of Form 1 to Form 2: Create a attribute or method that can access from Form 2 in Form 1. Event from Form 1 Subscribe to Form 2: Create an event in Form 2 and subscribe to it from Form 1.

Define an Action property in Form 2: When creating an instance of Form 2, a operation is assigned to this attribute to trigger the required behavior in Form 1.
Public Form 1 control to the public: pass the instance of Form 1 to Form 2, and directly modify the public control.
• Code example:
Operation FORM 2 in Form 1:

Use the constructor method:

In Form 1:

Operation Form 1 in Form 2:

<code class="language-csharp">public partial class Form2 : Form
{
    int selectedValue;
    public Form2(int value)
    {
        InitializeComponent();
        selectedValue = value;
    }
    //...
}</code>

Use ACTION attribute:

<code class="language-csharp">int value = 2;
var f = new Form2(value);</code>

In Form 1:

By using these technologies, you can effectively realize interaction between different windows in Windows Forms applications.

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