You could have a boolean inside the first If (boolFormat) which is set to true if the radio buttons are not checked,
and then inside the second If another boolean (boolMovieTitle) which is set to true if the movieTitleBox is empty.
Then you put other Ifs to check which of the booleans are set to true and display an individual error or both errors in the same box
e.g
If(boolFormat==true && boolMovietitle==true)
{
//display a compined error msg box
}
elseif (boolFormat==true &&boolMovieTitle==false)
{
//display Format error msg only
}
elseif (booolMovieTitle == true && boolFormat==false)
{
//display Title error msg only
}
Some of the syntax might be wrong, its been a while:(