tabcontrol2.dll: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/share/asp.net-demos/bin/tabcontrol2.dll - from package: asp.net-examples

You may install the required package with command apt-get install {package}

Error in other languages:
tabcontrol2.dll: bevel nie gevind nie
tabcontrol2.dll: comandă negăsită
tabcontrol2.dll: comando não encontrado
tabcontrol2.dll: commande introuvable
tabcontrol2.dll: command not found
tabcontrol2.dll: käsku ei ole
tabcontrol2.dll: không tìm thấy lệnh
tabcontrol2.dll: komanda nerasta
tabcontrol2.dll: Kommando nicht gefunden.
tabcontrol2.dll: kommandot finns inte
tabcontrol2.dll: komut yok
tabcontrol2.dll: nie znaleziono polecenia
tabcontrol2.dll: níor aimsíodh an t-ordú
tabcontrol2.dll: no se encontró la orden
tabcontrol2.dll: no s'ha trobat l'ordre
tabcontrol2.dll: opdracht niet gevonden
tabcontrol2.dll: parancs nem található
tabcontrol2.dll: perintah tidak ditemukan
tabcontrol2.dll: príkaz nenájdený
tabcontrol2.dll: příkaz nenalezen
tabcontrol2.dll: команда не найдена
tabcontrol2.dll: командата не е открита
tabcontrol2.dll: 命令找不到
tabcontrol2.dll: コマンドが見つかりません