Validation on a button click using RequiredFieldValidator

Question

In the past, on button click events, I've validated without using RequiredFieldValidators. However, I thought I'd learn about them and implement them. My old approach: ``` protected void btnSubmit_Click(object sender, EventArgs e) { if (txtSubject.Text.Equals("") || txtEmail.Text.Equals("") || txtComments.Text.Equals("")) { lblMessage.Text = "Please check all fields have been entered."; } //else if ...further validation statements e.g. check lengths } ``` However, using RequiredFieldValidators with the same example, am I correct in saying that I don't have to check again `if (txtSubject.Text.Equals("") || txtEmail.Text.Equals("") || txtComments.Text.Equals(""))` like below or is it good practice to do so? ``` protected void btnSubmit_Click(object sender, EventArgs e) { if (Page.IsValid) { //...further validation statements e.g. check lengths try { SendMail(); } catch (Exception) { } } } ``` If I should still include the line, it should go at the beginning of the if (Page.IsValid), rig…

Accepted Answer

why dont you do the following?

```
Page.Validate("save");
if (Page.IsValid) 
{
//Continue with your logic
}
else
{
//Display errors, hide controls, etc.
}
```

This only fires your validation group and furthermore , you can use a validation summary to display your message about the correct formats of the text boxes.

And you can display an error message then and there to display the correct format.

Validation on a button click using RequiredFieldValidator

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