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bool IsValidated = true; //will be checked on button click
void dateTimePicker1_Validating(object sender, CancelEventArgs e)

{   DateTimePicker datetimepicker = sender as DateTimePicker;

if (datetimepicker.Value == null)

{   errorProvider1.SetError(datetimepicker, "Required");
IsValidated = false;
} }
void comboBox_Validating(object sender, CancelEventArgs e)

{
ComboBox combo = sender as ComboBox;
if(combo.SelectedIndex == -1)
{
errorProvider1.SetError(combo, "Required");
IsValidated = false;
}}

void textBox_Validating(object sender, CancelEventArgs e)
{
TextBox txtbox = sender as TextBox;
if (txtbox.Text == "" || txtbox.Text.Length > 2)
{
errorProvider1.SetError(txtbox, "Required");
IsValidated = false;
}}

Ich habe eine Frage, vielleicht hilft mir jemand. Wissen Sie, dass in diesem Programm nach dem Entfernen des Fehlers "Fehleranbieter" verschwindet, wenn der Fehler nicht mehr Fehler ist, aber es wird angezeigt? (Entschuldigen Sie für grammatikalischen Fehler) < /p>

[code]bool IsValidated = true; //will be checked on button click
void dateTimePicker1_Validating(object sender, CancelEventArgs e)

{ DateTimePicker datetimepicker = sender as DateTimePicker;

if (datetimepicker.Value == null)

{ errorProvider1.SetError(datetimepicker, "Required");
IsValidated = false;
} }
void comboBox_Validating(object sender, CancelEventArgs e)

{
ComboBox combo = sender as ComboBox;
if(combo.SelectedIndex == -1)
{
errorProvider1.SetError(combo, "Required");
IsValidated = false;
}}

void textBox_Validating(object sender, CancelEventArgs e)
{
TextBox txtbox = sender as TextBox;
if (txtbox.Text == "" || txtbox.Text.Length > 2)
{
errorProvider1.SetError(txtbox, "Required");
IsValidated = false;
}}
[/code]