c# - How to close Login form which is coded into Form1 then show another form? -

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i have loginform coded mainform or form1, if inputed credentials correct directed form2 , loginform close, , form2 contains logout button, , if click logout button go loginform , input again credentials.

i want close or not shown in taskbar icon loginform when i'm login, want see 1 icon not 2 icon in taskbar.

note: loginform in form1, , form2 form.

void btnlogin_click(object sender, eventargs e)     {         bool error = true;         if ((txtuserlog.text.trim() == "") || (txtpasslog.text.trim() == ""))         {             messagebox.show("please fill fields!");         }         cfgotcall.tether(settings);         cfgotcall.engagequery("select * tblusers");         unitbl = cfgotcall.tbl;         cfgotcall.untether();         (int = 0; < unitbl.rows.count; i++)         {             if ((unitbl.rows[i].itemarray.elementat(2).tostring().equals(txtuserlog.text, stringcomparison.ordinalignorecase)) && (unitbl.rows[i].itemarray.elementat(3).equals(txtpasslog.text)))             {                 if (unitbl.rows[i].itemarray.elementat(4).tostring().equals("registrar", stringcomparison.ordinalignorecase))                 {                     error = false;                     = unitbl.rows.count;                     cfgotcall.engagequery("select * tblusers");                     frminterface sfinterface = new frminterface();                     sfinterface.enable_mnusim(true);                     sfinterface.showdialog();                 }                 else if (unitbl.rows[i].itemarray.elementat(4).tostring().equals("accounting", stringcomparison.ordinalignorecase))                 {                     error = false;                     = unitbl.rows.count;                     cfgotcall.engagequery("select * tblusers");                     frminterface sfinterface = new frminterface();                     sfinterface.enable_mnusam(true);                     sfinterface.showdialog();                 }          }

additional correct answer of @slashy:

  1. "use form1.visible = false;" or "this.visible = false;" because .close() on mainform exists whole program. #edit: ".hide()" @slashy edited possibility :)

  2. you shouldn't continue after showing messagebox wouldn't make sense, like:

if ((txtuserlog.text.trim() == "") || (txtpasslog.text.trim() == ""))             {                 messagebox.show("please fill fields!");                 return; // abort continuing when no data entered             }

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