![]() not set up to handle bindings to anything // other than DataView or DataTable continue If ( is DataView)īoundTable = (Įlse if ( is DataTable) get the bound table - if we're bound to a dataview, // we need to get the table from that // otherwise just get to the DataTable string boundTable = string.Empty ![]() get bound field name string boundField =Ĭ if the current control contains additional controls, run recursively if ( > 0) / /// parent control that contains databound controls private void CheckNewRecordRequiredControls(Control ctl)įoreach (Control control in ctl.Controls) / within to see if they required a value / /// Recursively check all controls contained In your form/control, in the declarations section, add the following lines of code: Setting up the 'Warning Provider'įor the sake of this article, let's assume you have a strongly typed DataSet called AppDataSet, and that it contains a DataTable called Customer, with two required fields: Customer_Name and Customer_Type. Thirdly, if you don't want the default error icon for your 'warning', then add an ImageList control to your control/form, and add the 16x16 icon that you wish to use.įourthly, create a method called ' GetDataSet()' which will give you your DataSet object. If you're not using Strongly-Typed DataSets, the 'Warning Provider' will still work, as long as you have set the appropriate constraints. If you are not, please give yourself a little slap on the wrist, and then go read some articles about Strongly-Typed DataSets. Hopefully anyone reading this article is making full use of Strongly-Typed DataSets. Secondly, we will be checking constraints on our DataSet. So, you need to be using bound controls for this to work. Prerequisitesįirst of all, I need to point out that we will be accessing the DataBinding information on our controls. Since the icon and message associated with the ErrorProvider can easily be changed, I figured that would be a good way to create a 'Warning Provider'. I have always liked using the ErrorProvider as an easy way to alert the user that something is wrong. One way to do that is to 'point out' required fields, when they're adding new records. = ErrorBlinkStyle.I like providing a friendly user interface for users of the applications I work on. You can also change the blink style to NeverBlink if you don't want to scare the user. = Icon.FromHandle(((Bitmap)imageList.Images).GetHicon()) If you want to change icon errorprovider c#, you can add an imagelist control to your winform, then set icon to the error provider control as the following c# code. Using c# errorprovider check if error through the Validating event handler. To clear error provider c# you can call the SetError method, then set value to null. If (string.IsNullOrEmpty(txtUsername.Text))ĮrrorProvider.SetError(txtUsername, "Please enter your user name !") ĮrrorProvider.SetError(txtUsername, null) private void txtUsername_Validating(object sender, CancelEventArgs e) MessageBox.Show(txtUsername.Text, "Message", MessageBoxButtons.OK, MessageBoxIcon.Information) Īdd the validating event handler to the TextBox allows you to check validate the TextBox control. If (ValidateChildren(ValidationConstraints.Enabled)) ![]() private void btnLogin_Click(object sender, EventArgs e) Next, add the click event handler to the Login button as the following c# code. If an error description string is specified for the control, an icon appears next to the control. ErrorProvider presents a simple mechanism for indicating to the end user that a control on a form has an error associated with it. ![]() You need to add an ErrorProvider control to your windows form application. To play the demo, you should create a new windows forms application project, next enter your project name is "ValidateDemo " and then click OK button.ĭrag the TextBox, Label and Button from your visual studio toolbox to your winform, then design a simple UI login form as shown below. Error Provider control that helps you validation data in c# winform. ![]()
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