How to validate textbox on key down event to accept only numbers in silverlight 4

Question

Hi i need a validation to check whether key pressed down is numeric or not. i tried with different code but they cant help me out.In the textbox if the user press Shift+numbers it displays special charcters like !@#...... I need to validate the Shift + key down event. Please find the sample code i tried below and help me out. private void txtNumericTextbox_KeyDown (object sender KeyEventArgs e) { try { if (e.Key Key.D9) { if (e.Key Key.NumPad9) { if (e.Key != Key.Back) { txtNumericTextbox_ .BorderBrush = new SolidColorBrush(Colors.Red); lblErrorMessage.Visibility = Visibility.Visible; lblErrorMessage.Text = Please Enter Numbers Only; } else { txtNumericTextbox_ .BorderBrush = new SolidColorBrush(Colors.DarkGray); lblErrorMessage.Visibility = Visibility.Collapsed; lblErrorMessage.Text = ; } } } Thanks Vijay

Pravin More · Answer

Hi Vijay You can use the ModifierKeys property on control to determine if the shift key is being held. if (Control.ModifierKeys == Keys.Shift ) { ... } and other code is correct for detecting number. Thanks Pravin.

Riddhi Valecha · Answer

Hi...There is no KeyPress Event in Silverlight Textboxes... The code for numbers worked out.... Try this for alphabets - if (((e.Key > Key .D0 && e.Key Key .D9) || (e.Key >= Key .NumPad0 && e.Key Key .NumPad9) || e.Key == Key .Back || e.Key == Key .Tab)) e.Handled = true ; else { e.Handled = false ; }

Pradip Pandey · Answer

Hi Riddhi If it helped please mark this as Accepted Answer.

Riddhi Valecha · Answer

Hi... Thanks a lot............ yes... this code worked out for me !!!!!

Pradip Pandey · Answer

Hi Riddhi Use this to accept only numeric values. Event you can choose textBox1_KeyDown nonnumberenter = false; if (e.KeyCode Keys.D9) { if (e.KeyCode Keys.NumPad9) { if (e.KeyCode != Keys.Back) { nonnumberenter = true; string abc = Please enter numbers only.; DialogResult result1 = MessageBox.Show(abc.ToString() Validate numbers MessageBoxButtons.OK); } } } if (Control.ModifierKeys == Keys.Shift) { nonnumberenter = true; string abc = Please enter numbers only.; DialogResult result1 = MessageBox.Show(abc.ToString() Validate numbers MessageBoxButtons.OK); } Use this to accept only characters. Event you can choose textBox1_KeyPress if (Char.IsNumber(e.KeyChar) || Char.IsSymbol(e.KeyChar) || Char.IsWhiteSpace(e.KeyChar) || Char.IsPunctuation(e.KeyChar)) { MessageBox.Show(Only Char are allowed); e.Handled = true; } Hope it will help.

Riddhi Valecha · Answer

Hi all... Please help me out ... I am having the same problem... There are 2 textboxes: 1st textbox - should accept only numeric values and 2nd should accept only characters value.. I am not getting how to do this... Please help... Thanks in advance !!

Priya Linge · Answer

Hi Please try this private void usertext_KeyDown(object sender KeyEventArgs e) { if (Keyboard.Modifiers == ModifierKeys.Shift) { e.Handled = true; MessageBox.Show(Please Enter Numbers Only); } if (!e.Handled && (e.Key Key.D9)) { if (e.Key Key.NumPad9) { if (e.Key != Key.Back) { e.Handled = true; } } } } Hope this will help you. Thanks.