make all buttons text bold too

foreach (var file in Directory.GetFiles(selectedPath))
{
    if (Path.GetFileName(file).StartsWith("Sla"))
    {
        Key_2_SLASH.ForeColor = Color.Red;
        KeyStrings[Num_Slash] = file;
    }
    if (Path.GetFileName(file).StartsWith("Mult"))
    {
        Key_3_MULTI.ForeColor = Color.Red;
        KeyStrings[Num_Multi] = file;
    }
    if (Path.GetFileName(file).StartsWith("Subtract"))
    {
        Key_4_MIN.ForeColor = Color.Red;
        KeyStrings[Num_Sub] = file;
    }
    if (Path.GetFileName(file).StartsWith("Seven"))
    {
        Key_5_SEVEN.ForeColor = Color.Red;
        KeyStrings[Num_7] = file;
    }
    if (Path.GetFileName(file).StartsWith("Eight"))
    {
        Key_6_EIGHT.ForeColor = Color.Red;
        KeyStrings[Num_8] = file;
    }
    if (Path.GetFileName(file).StartsWith("Nine"))
    {
        Key_7_NINE.ForeColor = Color.Red;
        KeyStrings[Num_9] = file;
    }
    if (Path.GetFileName(file).StartsWith("Plus"))
    {
        Key_8_PLUS.ForeColor = Color.Red;
        KeyStrings[Num_Plus] = file;
    }
    if (Path.GetFileName(file).StartsWith("Four"))
    {
        Key_9_FOUR.ForeColor = Color.Red;
        KeyStrings[Num_4] = file;
    }
    if (Path.GetFileName(file).StartsWith("Five"))
    {
        Key_FIVE.ForeColor = Color.Red;
        KeyStrings[Num_5] = file;
    }
    if (Path.GetFileName(file).StartsWith("Six"))
    {
        Key_11_SIX.ForeColor = Color.Red;
        KeyStrings[Num_6] = file;
    }
    if (Path.GetFileName(file).StartsWith("One"))
    {
        Key_12_ONE.ForeColor = Color.Red;
        KeyStrings[Num_1] = file;
    }
    if (Path.GetFileName(file).StartsWith("Two"))
    {
        Key_13_TWO.ForeColor = Color.Red;
        KeyStrings[Num_2] = file;
    }
    if (Path.GetFileName(file).StartsWith("Three"))
    {
        Key_14_THREE.ForeColor = Color.Red;
        KeyStrings[Num_3] = file;
    }
    if (Path.GetFileName(file).StartsWith("Zero"))
    {
        Key_16_ZERO.ForeColor = Color.Red;
        KeyStrings[Num_0] = file;
    }
    if (Path.GetFileName(file).StartsWith("F5"))
    {
        F5B.ForeColor = Color.Red;
        KeyStrings[F5_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F6"))
    {
        F6B.ForeColor = Color.Red;
        KeyStrings[F6_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F7"))
    {
        F7B.ForeColor = Color.Red;
        KeyStrings[F7_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F8"))
    {
        F8B.ForeColor = Color.Red;
        KeyStrings[F8_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F3"))
    {
        F3BB.ForeColor = Color.Red;
        KeyStrings[F3_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F4"))
    {
        F4B.ForeColor = Color.Red;
        KeyStrings[F4_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F9"))
    {
        F9B.ForeColor = Color.Red;
        KeyStrings[F9_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F10"))
    {
        F10B.ForeColor = Color.Red;
        KeyStrings[F10_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F11"))
    {
        F11B.ForeColor = Color.Red;
        KeyStrings[F11_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F12"))
    {
        F12B.ForeColor = Color.Red;
        KeyStrings[F12_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F_One"))
    {
        F1B.ForeColor = Color.Red;
        KeyStrings[F1_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("F2"))
    {
        F2B.ForeColor = Color.Red;
        KeyStrings[F2_Key] = file;
    }
    if (Path.GetFileName(file).StartsWith("Positive"))
    {
        Key_1_NUM.ForeColor = Color.Red;
        KeyStrings[OPlus] = file;
    }
    if (Path.GetFileName(file).StartsWith("Negative"))
    {
        Key_15.ForeColor = Color.Red;
        KeyStrings[OMinus] = file;
    }