errorProvider

Question

I created an errorProvider on an windows application to validate text boxes. It works great if I enter something values out side an int range. I cannot make it work if the box is blank or if I enter characters in the text box. How can errorProvider validate under these two conditions? private void buttonAccept_Click(object sender System.EventArgs e) { int pick totalPick max; max = int.Parse(textBoxMax.Text); totalPick = int.Parse(textBoxPick.Text); pick = int.Parse(textBoxEnterNumber.Text); if (countNumber>=totalPick) { errorProvider.SetError(textBoxEnterNumber You have picked  + totalPick +  the numbers.); } else if (pick max) { errorProvider.SetError(textBoxEnterNumber You must enter a number from 1 to  + max + .); } //This does not work else if (textBoxEnterNumber.Text == ) { errorProvider.SetError(textBoxEnterNumber You must enter a number from 1 to  + max + .); } else { countNumber++; numbers.Add(pick); textBoxEnterNumber.Clear(); textBoxMessages.Text += Number + (countNumber) + :  + pick.ToString()+
; errorProvider.SetError(textBoxEnterNumber ); } }

marcfromm · Answer

I got it working but I was wondering if there is a more efficient way of checking 4 textboxes and displaying the errorProvider next to the appropriate texboxdoing it than how I did it. private void buttonAccept_Click(object sender System.EventArgs e) { int pickNumber totalPick max; double attempts; pickNumber = totalPick = max = 0; attempts = 0; errorProvider.SetError(textBoxMax ); errorProvider.SetError(textBoxPick ); errorProvider.SetError(textBoxAttempts ); errorProvider.SetError(textBoxEnterNumber ); try { max = int.Parse(textBoxMax.Text); } catch (FormatException) { errorProvider.SetError(textBoxMax String must be a number.); return; } try { totalPick = int.Parse(textBoxPick.Text); } catch (FormatException) { errorProvider.SetError(textBoxPick String must be a number.); return; } try { attempts = double.Parse(textBoxAttempts.Text); } catch (FormatException) { errorProvider.SetError(textBoxAttempts String must be a number.); return; } try { pickNumber = int.Parse(textBoxEnterNumber.Text); } catch (FormatException) { errorProvider.SetError(textBoxEnterNumber String must be a number.); return; } . . . }

marcfromm · Answer

The try and catch did not work unless I there is special code to tell the try and catch to detect an empty textbox or a text box with characters instead of numbers. try { max = int.Parse(textBoxMax.Text); totalPick = int.Parse(textBoxPick.Text); pick = int.Parse(textBoxEnterNumber.Text); } catch { errorProvider.SetError(textBoxEnterNumber String must be a number.); return; }

robin 0 · Answer

If I understand correctly - you need to move check for empty string to beginning of the function and add check for numbers-only strings... like this: private void buttonAccept_Click(object sender System.EventArgs e) { int pick totalPick max; try { max = int.Parse(textBoxMax.Text); totalPick = int.Parse(textBoxPick.Text); pick = int.Parse(textBoxEnterNumber.Text); } catch { errorProvider.SetError(textBoxEnterNumber String must be a number.); return; } .......