Question

I have a custom web control having two labels. On the display page I want to modify the text of one of the labels depending on a condition.
How to achieve?

Answer 1

The answer depends on how your control in defined. If the label is public you simply access the label through the control instance

if(condition)
    mycontrol.label.Text = "Some text";

If it private you will need a public method in the control to change the text, e.g.

void SetLabelText(string text)
{
    this.label.Text = text;
}

and then call the method

if(condition)
    mycontrol.SetLabelText("Some text");