}//end of valid()
private void txtDuration_KeyDown(object sender, KeyEventArgs e)
{
if ((e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9) && (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9) && e.KeyCode != Keys.Back)
{
ErrorDuration.SetError(txtDuration, "Duration must be positive integer!");
e.SuppressKeyPress = true;
}
else
{
ErrorDuration.Clear();
}
}
public bool valid()
{
bool isError = false;
if (txtID.Text.Equals(""))
{
ErrorID.SetError(txtID, "ID must not be empty!");
isError = true;
}
if (txtAlbum.Text.Equals(""))
{
ErrorAlbum.SetError(txtAlbum, "Album must not be empty!");
isError = true;
}
if (txtSinger.Text.Equals(""))
{
ErrorSinger.SetError(txtSinger, "Singer must not be empty!");
isError = true;
}
if (listSongs.Items.Count == 0)
{
ErrorSong.SetError(listSongs, "You must add at least one song");
isError = true;
}
if (isError)
{
return(false);
}
else
{
ErrorID.Clear(); ErrorAlbum.Clear(); ErrorDuration.Clear();
ErrorSinger.Clear(); ErrorSong.Clear();
return(true);
}
}//end of valid()
