Tried

If (textBox1.Text.Length < 5 && textBox2.Text.Length < 5 && textBox3.Text.Length < 5)
{
return false;
}
else 
{
return true;
}

It only finds the textBox1 validation but not the other two.

Try to change the AND operators with OR:

If (textBox1.Text.Length < 5 || textBox2.Text.Length < 5 || textBox3.Text.Length < 5)
    return false;
else 
    return true;

It should work now.

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