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Message: <blockquote data-quote="asachan" data-source="post: 4868231" data-attributes="member: 189916">Correction======First of all your Form instance call is not complete it should be like this    frmCustomer fCus = new frmCustomer();    fCus.Activate();                 fCus.Show();Now it's complete and the form will be activated and windows handles will be created properly. without activate() , form never receive the forces . and if some other program runs as "Top owner level in User Mode" in windows , your form will not create handles to the User windows Mode in Kernel. Solution to your question man===================First you have to look that the given form instance is already in the Heap(U know what is heap right?) . so how can we do it?1. getting all active forms on the ApplicationFormCollection frms = Application.OpenForms;2. loop through forms and see if our form is in the collection bool formAvailable = false; foreach (Form frm in frms) {    if (frm.Name.Trim().ToUpper() == "frm_allCosting".ToUpper())    {          formAvailable = true;    }}if(formAvailable == true){   //this means ur form already run and give a message to uer}NOTE: "frm_allCosting" is the name of the form you need to look atHope this will help you man . good luck</blockquote>

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