Скачать или смотреть How to Set a TextBox Control in GridView Based on Conditions in C# ASP.NET

Learn how to dynamically change an `asp:Label` to an `asp:TextBox` in a GridView based on specific conditions in C# ASP.NET.
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Dynamically Change Controls in GridView Based on Conditions in C# ASP.NET

Creating dynamic web applications often requires us to change UI elements based on specific conditions. In this post, we’ll explore how to replace an asp:Label with an asp:TextBox in an ASP.NET GridView if a certain condition is met. Specifically, we will check if a string from a database column contains the word "ready".

The Problem

You have a GridView in your ASP.NET application that displays annotations stored in a database. By default, these annotations are displayed using an asp:Label. However, if the annotation contains the word "ready", you want to change that label to an asp:TextBox to allow editing. This dynamic behavior can significantly enhance the user experience by making your grid more interactive.

Default Setup

Initially, you have the following setup in your GridView:

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

Desired Change

If the string from the tannotation field contains the word "ready", you want to convert the Label into a TextBox:

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

The Solution

To implement this functionality, you can use the Visible property of the controls inside the ItemTemplate. Below are two approaches you can take: inline visibility control and a more modular method using a helper function.

Inline Control Method

You can directly manipulate the visibility of both controls in the ItemTemplate based on whether the tannotation string contains "ready". Here is how it can be done:

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

Using a Helper Method

For a more general use case where you may want to apply similar logic elsewhere, you can create a helper method. This encapsulates your logic better, making it reusable and cleaner.

Create a method that checks the string:

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

Use the helper method in your aspx markup:

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

Implementation in Code-behind

To ensure the GridView is correctly bound to data, make sure your RowDataBound event is properly set up in your code-behind:

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

Conclusion

With the above methods, you can successfully switch between displaying an asp:Label and an asp:TextBox in your GridView based on the presence of a specific word in a string. This not only makes your application more dynamic but also improves the overall user experience.

Feel free to implement these snippets in your ASP.NET application, and enhance the functionality of your GridView accordingly!