In GUI application (c# and Windows application)?

i want to use a textbox which must enter only numeric values by the user. how m i supposed to do this ? please mind that the control used must only be a textbox and not any other control.

In GUI application (c# and Windows application)?
Ignore the fool above.


Since .Net 2.0, there has been a MaskedTextBox control for exactly this purpose.


http://msdn2.microsoft.com/en-us/library...





Sample Code:


private void Form1_Load(object sender, EventArgs e)


{


maskedTextBox1.Mask = "00/00/0000";





maskedTextBox1. MaskInputRejected += new MaskInputRejectedEventHandler( maskedTextBox1_MaskInputRejected );


maskedTextBox1.KeyDown += new KeyEventHandler( maskedTextBox1_KeyDown );


}





void maskedTextBox1_MaskInputRejected (object sender, MaskInputRejectedEventArgs e)


{


if (maskedTextBox1.MaskFull )


{


toolTip1.ToolTipTitle = "Input Rejected - Too Much Data";


toolTip1.Show("You cannot enter any more data into the date field. Delete some characters in order to insert more data.", maskedTextBox1, 0, -20, 5000);


}


else if (e.Position == maskedTextBox1.Mask. Length)


{


toolTip1.ToolTipTitle = "Input Rejected - End of Field";


toolTip1.Show("You cannot add extra characters to the end of this date field.", maskedTextBox1, 0, -20, 5000);


}


else


{


toolTip1.ToolTipTitle = "Input Rejected";


toolTip1.Show("You can only add numeric characters (0-9) into this date field.", maskedTextBox1, 0, -20, 5000);


}


}





void maskedTextBox1_KeyDown(object sender, KeyEventArgs e)


{


// The balloon tip is visible for five seconds; if the user types any data before it disappears, collapse it ourselves.


toolTip1.Hide(maskedTextBox1);


}
Reply:If there are no inbuilt text box functions to accept particular data types only you will have to code it yourself to accept or reject whatever was entered.