validate a textbox input against database table column

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A user input a MAWB in a textbox, e.g. 234255.

The number is validated against a database table column (say, MAWB ).

I am using SQL server. The table column [staffID] is from a table (say, MAWB ).

How can I use CustomValidator, a handler to do that? How can I connect to the VIA table and compare the input value against column MAWB ?

If the number matches with one of the records in the database table column, then the textbox pass the validation.

I'm very new to programming. Is there some coding example please.

Posted 18-Feb-13 23:43pm

Hasitha Wijesooriya

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[no name] 19-Feb-13 5:56am

(40,857 online) plz help me?

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Asim Mahmood · Answer 1 · 2013-02-19T00:08:00

ASP.NET

<asp:textbox id="txtValidate" runat="server" autopostback="True" xmlns:asp="#unknown">
        ontextchanged="txtValidate_TextChanged" /></asp:textbox>

C#

protected void txtValidate_TextChanged(object sender, EventArgs e)
        {
           string query = "Select * from table where StaffId = " + Convert.ToInt32(txtValidate.Text);
          DataTable dtCount = ExecuteQuery(query);
          if(dtCount.Count > 0)
                true;
          else
                false;
        }

implement code like this. (HTML and Code Behind)