want to hide mainwindow at program start up

[masuk]

Hi,
i have two window. First window is mainwindow and Second window is suppose form1.

Now,

if(condition)
{
display form1; 
}

if(condition)
{
display form1; 
}

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i can display form1 but at the same time mainwindow also displayed. But i need only form1.

Is there any way how to hide mainwindow at program startup.

maybe someone posted this question before but i failed to get ans.

advance thnx.