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I have a Windows Forms project in which I am trying to set the attributes of a PropertyGrid with properties of the item I selected from a ListBox. I have a ListBox called listBox1 with two values (called "temporary" and "temporary2") and a PropertyGrid called propertyGrid1.

Here is my code:

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Windows.Forms;

using System.ComponentModel;

using System.Diagnostics;



namespace SortListProperties

{

        public partial class MainForm : Form

        {   

                public class SortProperties

                {

                        public string Name;

                        [CategoryAttribute(listBox1.SelectedItem.ToString()), DescriptionAttribute("Description of item goes here")]

                        public string Info

                        {

                                get

                                {

                                        return Name;

                                }



                                set

                                {

                                        Name = value;

                                }

                        }

                }

                public MainForm()

                {

                        InitializeComponent();

                        var properties = new SortProperties();

                        propertyGrid1.SelectedObject = properties;

                }

        }

}

Here is the initializing code:

    namespace SortListProperties

    {

        partial class MainForm

        {

                private System.ComponentModel.IContainer components = null;

                public System.Windows.Forms.ListBox listBox1;

                private System.Windows.Forms.PropertyGrid propertyGrid1;



                protected override void Dispose(bool disposing)

                {

                        if (disposing) {

                                if (components != null) {

                                        components.Dispose();

                                }

                        }

                        base.Dispose(disposing);

                }



                private void InitializeComponent()

                {

                        System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));

                        this.listBox1 = new System.Windows.Forms.ListBox();

                        this.propertyGrid1 = new System.Windows.Forms.PropertyGrid();

                        this.SuspendLayout();



                        this.listBox1.FormattingEnabled = true;

                        this.listBox1.Items.AddRange(new object {"temporary", "temporary2"});

                        this.listBox1.Location = new System.Drawing.Point(12, 50);

                        this.listBox1.Name = "listBox1";

                        this.listBox1.Size = new System.Drawing.Size(146, 238);

                        this.listBox1.TabIndex = 2;



                        this.propertyGrid1.Location = new System.Drawing.Point(164, 24);

                        this.propertyGrid1.Name = "propertyGrid1";

                        this.propertyGrid1.Size = new System.Drawing.Size(272, 261);

                        this.propertyGrid1.TabIndex = 3;



                        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

                        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

                        this.ClientSize = new System.Drawing.Size(448, 337);

                        this.Controls.Add(this.propertyGrid1);

                        this.Controls.Add(this.listBox1);

                        this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));

                        this.Name = "MainForm";

                        this.Text = "Get Item Properties Test";

                        this.ResumeLayout(false);

                        this.PerformLayout();



                }

        }

}

When I run the program, I get this error:

(15,23) : Error(CS0120): An object reference is required for the non-static field, method, or property 'SortListProperties.MainForm.listBox1'

This is what I expect

If someone could point out how to get the PropertyGrid to set the category name to the selected item of the list, that would be great. Thanks!