To make a winform fullscreen in C# and VB.NET you can use the following snippet.
Sample C#
public void SetFormFullscreen() { this.TopMost = true; this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.WindowState = System.Windows.Forms.FormWindowState.Maximized; }
Sample VB.NET
Public Sub SetFormFullscreen() Me.TopMost = True Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None Me.WindowState = System.Windows.Forms.FormWindowState.Maximized End Sub