errorProvider

marcfromm

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<1 || 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()+"\r\n"; errorProvider.SetError(textBoxEnterNumber, ""); } }

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marcfromm22y ago
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; } . . . }
marcfromm22y ago
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 022y ago
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; } .......