Скачать или смотреть How to Update DataGridView Across Different Forms in VB.NET

Learn how to efficiently update DataGridView values from multiple forms in VB.NET with this simple guide.
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This video is based on the question https://stackoverflow.com/q/75937010/ asked by the user 'GuidoM.' ( https://stackoverflow.com/u/21397801/ ) and on the answer https://stackoverflow.com/a/75943501/ provided by the user 'Idle_Mind' ( https://stackoverflow.com/u/2330053/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Updating DataGridView Across Different Forms in VB.NET

In the world of desktop application development, it's common to encounter situations where multiple forms need to interact with one another, especially when it comes to sharing data. One typical scenario involves needing to update a DataGridView in one form based on actions taken in another form. In this guide, we will explore a common question about how to pass data from one form to another in a VB.NET application and update a DataGridView accordingly.

The Problem

Suppose you have a VB.NET application with three different forms: Form1, Form2, and Form3. Both Form1 and Form2 have a DataGridView, and you need to retrieve a value from the DataGridView of the form that's currently open before calling Form3. The challenge lies in the fact that you are encountering an error message stating that 'DataGridView1' is not a member of 'String'. This error often arises when trying to reference a control in a manner that does not acknowledge its actual data type.

The Solution

To tackle this problem, we will break down the solution into clear steps, ensuring a smooth process to pass data between forms.

Step 1: Opening Form3 with Owner Reference

When you need to open Form3 from either Form1 or Form2, you should pass the current form instance (Me). This will set the Owner property in Form3, allowing you to reference the calling form easily.

Here's how you can do it in Form1 or Form2:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Accessing the Owner in Form3

Once you have Form3 open, you can access the Owner property, which will give you a reference back to the calling form (either Form1 or Form2). You can then find the DataGridView control dynamically by its name.

Here’s what you need to include in Form3:

[[See Video to Reveal this Text or Code Snippet]]

Recap of Key Points

Open Form with Owner: Always pass Me when opening Form3 to maintain a reference to the calling form.

Find Control Dynamically: Use the Controls.Find method to locate the DataGridView by its name.

Type Checking: Ensure that the control found is indeed a DataGridView before trying to access its properties.

Conclusion

By following the steps outlined in this guide, you can effectively share data between multiple forms in your VB.NET applications without creating public properties or other direct references. This method enhances your application's structure and maintains clean code practices. Don't hesitate to implement these techniques in your own projects to streamline your forms' interactions!

If you have any further questions or need assistance with your own VB.NET projects, feel free to leave a comment below!