Need using textbox value ONLY not specific number in codes

Question

Hi,

 

These little code work fine. But I need that the message appear only when a number superior is inserted into textbox. Not number inside of codes. 

 

Int32 number = 0; Boolean success = false;

success = Int32.TryParse(txtCredit.Text, out number);

if (!success)

MessageBox.Show("Please enter a valid integer value!");

else

if (number >= 5) // Here is works but ONLY with number

// I'm trying to do this but its doenst work

if (number >= txtCredit.Text) // But here doesnt work. Its underlined in red.

MessageBox.Show("Atenção: Sua despesa é superior ao SALDO atualizado!");

 

Thanks,

Israel.