How Do I Make My Form Size Grow And Shrink

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C#

hi , ive got a form with some labels and group boxes ect ect, but when i resize the main form while app is running only the border expands and not the whole form ,
thanks in advance
used this code:

this.TopMost = true;
        this.FormBorderStyle = FormBorderStyle.None;
        this.WindowState = FormWindowState.Maximized;

but it strecthes the form and not its content within