Remove all items in listbox c#

Clear all items in a ListBox : ListBox«GUI Windows Form«C# / C Sharp

1. C# / C Sharp
2. GUI Windows Form
3. ListBox

Clear all items in a ListBox

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form { private System.Windows.Forms.ListBox displayListBox; private System.Windows.Forms.TextBox inputTextBox; private System.Windows.Forms.Button addButton; private System.Windows.Forms.Button removeButton; private System.Windows.Forms.Button clearButton; public Form1() { InitializeComponent(); } private void addButton_Click( object sender, EventArgs e ) { displayListBox.Items.Add( inputTextBox.Text ); inputTextBox.Clear(); } private void removeButton_Click( object sender, EventArgs e ) { if ( displayListBox.SelectedIndex != -1 ) displayListBox.Items.RemoveAt( displayListBox.SelectedIndex ); } private void clearButton_Click( object sender, EventArgs e ) { displayListBox.Items.Clear(); } private void InitializeComponent() { this.displayListBox = new System.Windows.Forms.ListBox(); this.inputTextBox = new System.Windows.Forms.TextBox(); this.addButton = new System.Windows.Forms.Button(); this.removeButton = new System.Windows.Forms.Button(); this.clearButton = new System.Windows.Forms.Button(); this.SuspendLayout(); // // displayListBox // this.displayListBox.FormattingEnabled = true; this.displayListBox.Location = new System.Drawing.Point(13, 12); this.displayListBox.Name = "displayListBox"; this.displayListBox.Size = new System.Drawing.Size(119, 238); this.displayListBox.TabIndex = 0; // // inputTextBox // this.inputTextBox.Location = new System.Drawing.Point(149, 12); this.inputTextBox.Name = "inputTextBox"; this.inputTextBox.Size = new System.Drawing.Size(100, 20); this.inputTextBox.TabIndex = 1; // // addButton // this.addButton.Location = new System.Drawing.Point(149, 56); this.addButton.Name = "addButton"; this.addButton.Size = new System.Drawing.Size(100, 36); this.addButton.TabIndex = 2; this.addButton.Text = "Add"; this.addButton.Click += new System.EventHandler(this.addButton_Click); // // removeButton // this.removeButton.Location = new System.Drawing.Point(149, 109); this.removeButton.Name = "removeButton"; this.removeButton.Size = new System.Drawing.Size(100, 36); this.removeButton.TabIndex = 3; this.removeButton.Text = "Remove"; this.removeButton.Click += new System.EventHandler(this.removeButton_Click); // // clearButton // this.clearButton.Location = new System.Drawing.Point(149, 165); this.clearButton.Name = "clearButton"; this.clearButton.Size = new System.Drawing.Size(100, 36); this.clearButton.TabIndex = 4; this.clearButton.Text = "Clear"; this.clearButton.Click += new System.EventHandler(this.clearButton_Click); // ListBoxTestForm // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(263, 268); this.Controls.Add(this.clearButton); this.Controls.Add(this.removeButton); this.Controls.Add(this.addButton); this.Controls.Add(this.inputTextBox); this.Controls.Add(this.displayListBox); this.Name = "ListBoxTestForm"; this.Text = "ListBoxTest"; this.ResumeLayout(false); this.PerformLayout(); } [STAThread] static void Main() { Application.EnableVisualStyles(); Application.Run(new Form1()); } }

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