Может кому то надо.... private void Form1_Deactivate(object sender, EventArgs e) { if (this.WindowState == FormWindowState.Minimized) { this.ShowInTaskbar = false; } } private void Minimizedbutt_Click(object sender, EventArgs e) { if (this.WindowState == FormWindowState.Normal) { this.WindowState = FormWindowState.Minimized; this.ShowInTaskbar = true; } } Код private void Form1_Deactivate(object sender, EventArgs e) { if (this.WindowState == FormWindowState.Minimized) { this.ShowInTaskbar = false; } } private void Minimizedbutt_Click(object sender, EventArgs e) { if (this.WindowState == FormWindowState.Normal) { this.WindowState = FormWindowState.Minimized; this.ShowInTaskbar = true; } }