Validating html controles
This is when row validation takes place and the default Error Dialog with the specified error text is invoked.
Click Yes and then hover over error icons to see error messages specified for individual columns.
Once the value is entered other columns should be filled with data based on the user input in column 1.
The grid control has built-in data type validation enabled by default.
This Required Field Validator forces the user to enter text into the control associated with the validator. If you want to make sure the user changes a default value placed into the control, set the control’s Text value and the Initial Value property of the Required Field Validator to the same value.
The associated control is set by right clicking on the validator and selecting Properties from the context menu. The rest of the validation controls provided by ASP.
The cancel button has a Causes Validation property. As we mentioned in the beginning of the article, validation can occur twice: once on the client’s machine and once on the server. Client side validation provides quick feedback for the user.Place four controls from the Web forms section of the Toolbox onto the form. If Is Valid returns a value of true then all of the validation checks were successful.Drag one Text Box control and give it an ID of First Name Text Box, two Button controls (Submit Button and Cancel Button), and one Required Field Validator (First Name Required Field Validator). The following screen shows the form in action, and the user has pressed the Submit button without entering any text into the textbox. The Required Field Validator fails when the value in the associated control matches the value of the Initial Value property of the Required Field Validator.Correct the entered value or discard changes to continue working with the grid control. If a value's validity depends on other values within the same row, you can enable row validation by handling the Column View. For instance, make sure that values in one column are greater than values in another column.Run the application, enter the invalid value and try to switch focus to another row.