C# 10 - NullReferenceException when accessing properties of dynamically added controls in WinForms
I'm working through a tutorial and I'm stuck trying to I've looked through the documentation and I'm still confused about I've searched everywhere and can't find a clear answer..... I'm working with a `NullReferenceException` when trying to access properties of dynamically added controls in a WinForms application. I'm using C# 10 and .NET 6. The scenario arises when I attempt to set the properties of a `TextBox` I've added to a `Form` during runtime. Here's a simplified version of my code: ```csharp private void AddTextBox() { TextBox textBox = new TextBox(); textBox.Name = "dynamicTextBox"; textBox.Location = new System.Drawing.Point(10, 10); this.Controls.Add(textBox); } private void UpdateTextBox() { TextBox textBox = this.Controls["dynamicTextBox"] as TextBox; textBox.Text = "Hello, World!"; // This line throws NullReferenceException } ``` I call `AddTextBox()` in the `Form_Load` event, and then I call `UpdateTextBox()` in a button click event. The `AddTextBox()` method runs successfully, and the control is added to the form, but when I try to access it in `UpdateTextBox()`, it throws the exception. I've checked that the control is indeed added by using `this.Controls.ContainsKey("dynamicTextBox")`, which returns true. What could be causing this scenario? Is there something I'm missing with the way I'm trying to access the dynamically added control? Any insights would be appreciated! This is part of a larger CLI tool I'm building. This is part of a larger web app I'm building. What am I doing wrong? I'm developing on Debian with C#. Any help would be greatly appreciated! Could this be a known issue?