Open Form only one Time

Question

Hello All I open several Forms in one main Form... But my problem is that an allready opened Form is opening the second... third... fourth... time if I click on that button. How it is possible to void a new opening of a allready opened Form? and If possible how can I sent a warning that the Form is allready open...? thank you in advance my procedure to open a form SimFrm gsm = new SimFrm(this); gsm.TopLevel = False; this.Controls.Add(gsm); gsm.Show();

Vulpes · Answer

Try this: if(Application.OpenForms[gsm] == null) { SimFrm gsm = new SimFrm(this); gsm.Name = gsm; gsm.TopLevel = False; this.Controls.Add(gsm); gsm.Show(); } else { MessageBox.Show(gsm form is already open); }

Vulpes · Answer

In that case I'd do: private void btnRoundUp_Click(object sender EventArgs e) { if(Application.OpenForms[frmRoundUp] == null) { frmRoundUp frm = new frmRoundUp(); frm.Name = frmRoundUp; frm.Show(); } else { MessageBox.Show(RoundUp form is already open); } }

raj kiran · Answer

Hi Even i have the same problem but i am not having any idea about except to open a form this way and i am doing by private void btnRoundUp_Click(object sender EventArgs e) { frmRoundUp frm = new frmRoundUp(); frm.Show(); } What should i do here to stop the other form opening for number of this if opened one this display it again on top of all forms Thanks you for looking to my quire