The validation of TextBox will be performed using the Validating event handler and the error message will be displayed using the ErrorProvider control in Windows Application (WinForms) using C and VB.Net. You can also download the source code of this example. Here Mudassar Ahmed Khan has explained with an example, how to validate TextBox in Windows Application (WinForms) using C and VB.Net. If the user hovers the mouse over the error icon, then it shows an error description string that we have declared in the setError() method. The setError method sets the error description string for the specified control. This is done using the " setError()" method. In the " txt_nameValidating()" event, if txt_name is left empty, then it shows error. NET ErrorProvider Control with a custom balloon tooltip. Regex numberchk= new Regex( ^(*|\d*)$") ĮrrorProvider3.SetError(txt_age, " Correct") ĮrrorProvider2.SetError(txt_age, " Wrong format") For example, when you click search on a Windows form, you dont have to do a request again if. On the form, add 2 TextBox controls (that you will name txtFName and txtLName), a ErrorProvider control. Void Txt_ageValidating( object sender, e)ĮrrorProvider1.SetError(txt_age, " Please provide age") To do this, create a new VB.Net Windows application. Void Txt_nameValidating( object sender, e)ĮrrorProvider1.SetError(txt_name, " Please Enter Name") ĮrrorProvider3.SetError(txt_name, " Correct") In addition to defaults imports, I am adding Regular Expression library support for the txt_age text box as in the following: Asp.net DNNTelerik asp.net vb.net telerik Asp.net MVC3 asp.net asp.net-mvc-3 msbuild Asp.net asp.net entity-framework Asp.net Authorize.I will use the warning errorprovider when the user leaves a text box blank, use a cross or wrong when the user enters incorrect format (for the Age text box) and a tick icon for when all conditions are satisfied. Set the Icon for errorProvider1 (warning), errorProvider2 (wrong or cross) and errorProvider3 as a tick mark (for a correct entry).I have also created a button but there is no use for it (in the example). Set text boxes are named txt_name and txt_age. Place two text boxes (for getting name and age) and three ErrorProvider controls from the toolbox.Create a new Windows Forms Application.The following image illustrates the resulting form after it has been opened at runtime. In this example, the DXErrorProvider.DataSource property is set to the BindingSource. ![]() In this example, I will use a Display Warning icon, wrong icon (when an incorrect expression is entered or a Tick icon depending upon the data entered in the text box so that the user can determine that data entered is correct or incorrect. To automatically track errors supplied by a data source, the DXErrorProvider component must be bound to this data source via the DXErrorProvider.DataSource property. We do not want to bother our users with "Int32" but want a custom errormessage for that.In this tip and trick, I am going to show you how to use error provider control in Windows Form application(C#).Īctually, the error provider alerts the user that something is wrong. "9999999999") the BindingSource doesn't even try to enter that Value into the BusinesObject but instead gives the errormessage to the errorprovider like "The value for Int32 was too big.". However, if the input is greater than the value of an int (e.g. That works fine, since error message form our custom validations show up nicely next to the TextBox. ![]() ![]() ![]() They are validated inside the BusinessObjects with custom validation, like min/max values, etc. We do use currently TextBoxes for Properties of Type int and short. This prevents the user from circumventing your validation by pasting text or otherwise setting the text without 'typing'. The BindingSource is additionally set as DataSource to the ErrorProvider of the form. BindingLists with those Objects are added to BindingSources, those are used to bind UserControls and DataGrids on the forms (WinForms). We use BusinessObjects, implementing IDataErrorInfo and IEditableObject.
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