Web Forms :: How To Validate A Textbox Value Against MS Access Database
Mar 26, 2011
I'm trying to create a simple user registration page. I'm using an MS Access database which has some test data in it. What I would like to do is use a CustomValidator on the user name textbox to check if the user name entered already exists in the database. I've read about the possibility of using the ServerValidate event for the CustomValidator control but I can't figure out how to make a connection to the database, query it to check the existing user names, and then fire off the CustomValidator if the user name exists.
I have a aspxtextbox and its validated from database.If text exists in database then it shows message Username exist.Now this is all happens on click of a aspxbutton after typing some text into aspxtextbox.I just want that when user defocus the textbox then it will automatically check from database and shows the message if exists.
VS2008 c#, asp.net 3.5, ms sql 2008How do I validate user input in TextBox inside a FormView [Insert Mode] with MS SQL 2008 Database?* FormView #fvInsertProjectInfo* TextBox #txtProjectNameCurrently, user could insert a new project using the FormView, but will only be found out that the project is already existed when pressing the INSERT button. To make it more user friendly, I would like to check that the database does not contain a record of the project the user trying to insert (by comparing value in txtProjectName with the Projects table in the database)
I aam working with textChanged event in a textbox to validate a value in textbox.hen i am enter data in textbox then press submit button i am getting validation summary before the textbox textchanged event. Is there anyway to fire textchanged event first to validate before button validation summary?
i am trying to update my database via a textbox on my web page.
so that when a number is entered into this textbox and the button is clicked, it goes and changes the previous value to the one u have just entered.
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click Try ' cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents and SettingsAshMyDocumentsplatypus_holidays.mdb;") 'Connection String cn.Open() str = "update holidays set holidays_left=" & CInt(TextBox3.Text) cmd = New OleDbCommand(str, cn) icount = cmd.ExecuteNonQuery TextBox4.Text = "The value was change to " & icount Catch TextBox4.Text = "The value was not Updated" End Try update_holiday_values() cn.Close() End Sub
if txtQuantity is a positive Number I must enter something in txtDesc
So
I can't submit the form without entering txtDesc if txtQuantity is positive/decimal number & No need to enter anything in txtDesc if the txtQuantity is 0/null/empty/space/spaces/blank How?
I have a textbox called "tax rate" which I need to validate the input... The only thing I need to ensure is that the value entered is a number (decimals ok of course). eg. the input might be "8.75" How do I write the validation expression?
I have tried everything and can't seem to wrap my head around it...I am trying to use the RegularExpressionValidator to validate that a asp:textbox has an '' in the value that the user types in, and it can't be the first or last character.
I'm developing an an asp.net 2 application in c#. This site is being built with accessibility in mind, and as such I need a to build a registration from that validates using server side scripts and not use client side validation.I need to validate a textbox (whether any text has been entered), if a check box has been checked.
Bear in mind that I can't use any clientside code such as javascript postback that is wired into the <asp:CheckBox /> control.
I have a textbox that I am "custom" validating to lookup in a table to see if the name exists. When I test it out, if it finds a duplicate, the validation results in an error message as I would expect. First is this only works if I add autopostback to my textbox and that I click elsewhere on the page. The other issue is that after I type a string in my textbox, I want it to validate such that if it returns an error, I don't want to submit the form until the validation is good.
I hav ADMIN_ID textbox and ROLES dropdownlist, when I enter ADMIN_ID such as staff001 then at ROLES dropdownlist I must select "staff" else display an error msg, for example staff002 with roles manager.
I want to validate a textbox with regular expression so you only can enter numeric characters, but now I want that the error validation appear if the textbox be empty. here is the code
Types.Add("NUMBER", new Validation(@"[d]{1,255}","Only numbers can be entered in this field."));
How to validate the textboxes to avoid wrong information..for ex: I have a textbox phoneNum in that users can only enter the nums only. how to validate that?
DateTime dateformat; if (DateTime.TryParseExact(TxtDate.Text, "dd-MMM-yyyy", null, DateTimeStyles.None, out dateformat) == false) { lblErrMsg.Text = "Enter valid Txtdate"; return; }
by using above query i am alert the if date entry format wrong. it is working fine but when ever if user not enter any date in TxtDate.Text then no need to alert just save datetime.minvalue. how to do it.
I need to validate textbox so that it will contain only numbers or comm or dot, or any combination of them. I can validate them to include only digits..
