Question

I am trying to make the save button visible when text is entered into the text box by using the following code:

    if (tbName.TextModified == true)
    {
        btnCTimetablesOk.Visible = true;
    }
     else
    {
        btnCTimetablesOk.Visible = false;
    }

but it gives error at tbname.textmodified

is there any other way to visible the button when we enter the text in text box

this is error i am getting “the event textbox.textmodified can only appear on the left hand side of += or -=”

Answer 1

If I’m reading your text correctly, you want the save button to be visible when the textbox has text in it and invisible when the text box is blank. If that’s the case, you can use the Leave event (which occurs when the textbox loses focus) and a simple if statement:

private void textBox1_Leave(object sender, System.EventArgs e)
{
  if(textBox1.Text != "")
    btnCTimetablesOk.Visible = true;
  else
    btnCTimetablesOk.Visible = false;
}

You can also put this conditional block in any other methods kicked off by events that change the text of the box.

Also, you might want to consider using Enabled instead of Visible, it’ll leave the button on the form but will gray out the text and clicking will do nothing.