refresh form view

Question

Is there a way to refresh the from display so text boxes display current information? With my windows application, the form does not display information in the textboxes until the for loop is comlpete, even though inside the for loop I have "textBoxName.Text = line." "line" is a string and is constantly changing as the for loop increments; however only the last value of line is displayed in the textBoxName after the for loop is complete.