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Asked: 2026-05-10T21:38:35+00:00

I have a control that is created like so: public partial class MYControl :

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I have a control that is created like so:

public partial class MYControl : MyControlBase {     public string InnerText {         get { return textBox1.Text; }         set { textBox1.Text = value; }      }     public MYControl()     {         InitializeComponent();     } }  partial class MYControl {     /// <summary>      /// Required designer variable.     /// </summary>     private System.ComponentModel.IContainer components = null;      /// <summary>      /// Clean up any resources being used.     /// </summary>     /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>     protected override void Dispose(bool disposing)     {         if (disposing && (components != null))         {             components.Dispose();         }         base.Dispose(disposing);     }      #region Component Designer generated code      /// <summary>      /// Required method for Designer support - do not modify      /// the contents of this method with the code editor.     /// </summary>     private void InitializeComponent()     {         this.textBox1 = new System.Windows.Forms.TextBox();         this.listBox1 = new System.Windows.Forms.ListBox();         this.label1 = new System.Windows.Forms.Label();         this.SuspendLayout();         //          // textBox1         //          this.textBox1.Location = new System.Drawing.Point(28, 61);         this.textBox1.Name = "textBox1";         this.textBox1.Size = new System.Drawing.Size(100, 20);         this.textBox1.TabIndex = 0;         //          // listBox1         //          this.listBox1.FormattingEnabled = true;         this.listBox1.Location = new System.Drawing.Point(7, 106);         this.listBox1.Name = "listBox1";         this.listBox1.Size = new System.Drawing.Size(120, 95);         this.listBox1.TabIndex = 1;         //          // label1         //          this.label1.AutoSize = true;         this.label1.Location = new System.Drawing.Point(91, 42);         this.label1.Name = "label1";         this.label1.Size = new System.Drawing.Size(35, 13);         this.label1.TabIndex = 2;         this.label1.Text = "label1";         //          // MYControl         //          this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);         this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;         this.Controls.Add(this.label1);         this.Controls.Add(this.listBox1);         this.Controls.Add(this.textBox1);         this.Name = "MYControl";         this.Size = new System.Drawing.Size(135, 214);         this.ResumeLayout(false);         this.PerformLayout();      }      #endregion           private System.Windows.Forms.Label label1; }

MyControlBase contains the definition for the ListBox and TextBox. Now when I try to view this control in the Form Designer it gives me these errors:

The variable ‘listBox1’ is either undeclared or was never assigned.

The variable ‘textBox1’ is either undeclared or was never assigned.

This is obviously wrong as they are defined in MyControlBase with public access. Is there any way to massage Form Designer into allowing me to visually edit my control?

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1 Answer

  1. I think you’ll have to use base.listBox1 and base.textBox1. They are defined in MyControlBase which is the base class, not the child class where you need to use the this keyword.

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