validation coding

[kool.net]

hi,
i want to write code on validation of text box , combo box
for make them not null fields,
And other for mae a text box only accept integer , one only accept string not integer value.
so pls. tell me where shud i write dis code & give me some examples of code

[coder4Ever]

if u want to know z fields r empty or not ...
use their name like this

if(txtbox1.Text==String.Emtpy) { //do something } and if u want to only accept integers or strings .... 1st go to keystroke property ..... then check wheterh the character key pressed is string or int and like that[CODE=C#] if(txtbox1.Text==String.Emtpy)
{
//do something
}
and if u want to only accept integers or strings ....
1st go to keystroke property ..... then check wheterh the character key pressed is string or int and like that

[sknake]

Try something like this:

private void btnAdd_Click(object sender, EventArgs e)
    {
      //Must be an integer
      int scoreInput;
      if (string.IsNullOrEmpty(txtScore.Text) || !int.TryParse(txtScore.Text, out scoreInput))
      {
        txtScore.Focus();
        MessageBox.Show("Please enter a valid score", "Input Error");
        txtScore.Focus(); //in case they double click the message and select another ctrl
        return;
      }
      else if ((scoreInput < 0) || (scoreInput > 100))
      {
        txtScore.Focus();
        MessageBox.Show("The score must be between 0 and 100", "Input Error");
        txtScore.Focus(); //in case they double click the message and select another ctrl
        return;
      }

      int avgInput;
      if (string.IsNullOrEmpty(txtAverage.Text) || !int.TryParse(txtAverage.Text, out avgInput))
      {
        txtAverage.Focus();
        MessageBox.Show("Average is not allowed to be a number. Please provide a different value", "Input Error");
        txtAverage.Focus(); //in case they double click the message and select another ctrl
        return;
      }

[DdoubleD]

Here is an example of capturing the KeyDown and KeyPress events for a textbox to limit numeric input. You could also modify this logic to accept only the characters you want: Limiting input in control...

In addition to the examples sknake gave you, you might want to read up on Validating and Validated methods: Validating entered data...

[mikiurban]

Are these for a web page? You can look at RegularExpressionValidator and RequiredFieldValidator too

[kool.net]

i am using windows application not web froms

[avirag]

i am using windows application not web froms

Well in win forms you can do simple like this on button click:

if(textbox1.text=" ")
{
Messagebox.show("Please enter some value");
}

Similarly for combobox...........
Hope this help you..........:)

[avirag]

Mark this thread as solved, if it help you........