c# - Can't get desired tabPage & form to display on startup -

revising question ask why after finding offending line trial , error. hints answers suggested occurring after form load. found line setting tabcontrol1.selectedindex = 1; tabpage2 index 1 why wasn't selecting tabpage2? after changing 1 0 displays correctly.

i can't find white paper or tutorial on tabcontrol , use of selectedindex can tell me how works?

 private void form1_load(object sender, eventargs e)         {             getregions();             tabcontrol1.selectedindex = 1; 

i have windows form had 10 tabpages on tabcontrol1. change in requirement necessitated except 2 & 8. prior removing tabpages, tabpage2 , form displayed @ startup. can remove 3,4,5,6,7,9,10 without problem (1,2,8 left). if remove tabpage1 tabpage , form displays @ startup tabpage8. tabpage2 , stay way.

i've played on , off couple of weeks , stumped. can't seem find article or question describing this. found multiple suggestions add this.tabcontrol1.selectedtab = tabpage2; doesn't seem anything.

what might causing , need do? (don't know code need paste, let me know if more needed)

// tabcontrol1             //              this.tabcontrol1.anchor = ((system.windows.forms.anchorstyles)((((system.windows.forms.anchorstyles.top | system.windows.forms.anchorstyles.bottom)              | system.windows.forms.anchorstyles.left)              | system.windows.forms.anchorstyles.right)));             this.tabcontrol1.controls.add(this.tabpage2);             this.tabcontrol1.controls.add(this.tabpage8);             this.tabcontrol1.location = new system.drawing.point(13, 27);             this.tabcontrol1.name = "tabcontrol1";             this.tabcontrol1.selectedindex = 1;             this.tabcontrol1.size = new system.drawing.size(963, 483);             this.tabcontrol1.tabindex = 1;             this.tabcontrol1.selectedtab = tabpage2;          // tabpage1         //          this.tabpage1.location = new system.drawing.point(4, 22);         this.tabpage1.name = "tabpage1";         this.tabpage1.padding = new system.windows.forms.padding(3);         this.tabpage1.size = new system.drawing.size(955, 457);         this.tabpage1.tabindex = 0;         this.tabpage1.text = "region overall status";         this.tabpage1.usevisualstylebackcolor = true;         //            // tabpage2         //          this.tabpage2.controls.add(this.lstbuildlist);         this.tabpage2.controls.add(this.label9);         this.tabpage2.controls.add(this.label8);         this.tabpage2.controls.add(this.lblfilelookup);         this.tabpage2.controls.add(this.btnfilelookup);         this.tabpage2.controls.add(this.cbregion);         this.tabpage2.controls.add(this.tabcontrol2);         this.tabpage2.controls.add(this.tvfileman);         this.tabpage2.controls.add(this.txtfilelookup);         this.tabpage2.controls.add(this.cbregionsites);         this.tabpage2.location = new system.drawing.point(4, 22);         this.tabpage2.name = "tabpage2";         this.tabpage2.padding = new system.windows.forms.padding(3);         this.tabpage2.size = new system.drawing.size(955, 457);         this.tabpage2.tabindex = 1;         this.tabpage2.text = "build attribute maps vista files";         this.tabpage2.usevisualstylebackcolor = true;         this.tabpage2.click += new system.eventhandler(this.tabpage2_click);            // tabpage8         //          this.tabpage8.location = new system.drawing.point(4, 22);         this.tabpage8.name = "tabpage8";         this.tabpage8.padding = new system.windows.forms.padding(3);         this.tabpage8.size = new system.drawing.size(955, 457);         this.tabpage8.tabindex = 0;         this.tabpage8.text = "edit attribute map/ create sql tables attribute map";         this.tabpage8.usevisualstylebackcolor = true;         this.tabpage8.click += new system.eventhandler(this.tabpage8_click);         this.tabcontrol1.selectedtab = tabpage2;         //  

you can select tabpage after initializecomponent or @ form_load display @ startup.

here's sample code have tested

namespace windowsformsapplication1 {     public partial class form1 : form     {         public form1()         {             initializecomponent();             //select tabpage after initialize             tabcontrol1.selectedtab = tabpage3;         }          private void form1_load(object sender, eventargs e)         {             //you can select @ form load or @ other action button click             //tabcontrol1.selectedtab = tabpage3;         }     } } 

don't write code @ designer. write after initializecomponent call.