Do I have to call Validate() in a code-behind file?
Question
I have the following event handler in my code-behind file that fires whenever an HTML form is submitted to the server:
public void Validate_Form(object sender, EventArgs e)
{
// Check that the page is loaded due to a postback:
if (IsPostBack)
{
// Check that the page passed validation:
if (IsValid)
{
// perform some logic...
}
}
}
My question is do I need to explicitly call Validate() method right before my if (IsValid) directive? What would be the difference between the following:
if (IsValid) Validate();
{ if (IsValid)
... vs. {
} ...
}
And since I am not seeing any errors / warnings, does that mean that the two above are identical? Thanks!
1 answers
solution1
0 2016-09-04 10:31:25
They are not the same output.So explain this with an example. (You should turn off javascript for testing)
Suppose you have a page as follows:
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox runat="server" ID="txtTest1"></asp:TextBox>
<asp:RequiredFieldValidator ValidationGroup="ValidationGroup1" runat="server" ControlToValidate="txtTest1"></asp:RequiredFieldValidator>
<asp:Button runat="server" ValidationGroup="ValidationGroup1" ID="btnValidate1" Text="Validate1" OnClick="Validate_Form" />
<asp:TextBox runat="server" ID="txtTest2"></asp:TextBox>
<asp:RequiredFieldValidator ValidationGroup="ValidationGroup2" runat="server" ControlToValidate="txtTest2"></asp:RequiredFieldValidator>
<asp:Button runat="server" ValidationGroup="ValidationGroup2" ID="btnValidate2" Text="Validate2" OnClick="Validate_Form" />
</div>
</form>
</body>
If we use first method:
public void Validate_Form(object sender, EventArgs e)
{
// Check that the page is loaded due to a postback:
if (IsPostBack)
{
// Check that the page passed validation:
if (IsValid)
{
// perform some logic...
}
}
}
Validation buttons work properly.
But if we use second method:
public void Validate_Form(object sender, EventArgs e)
{
Validate();
// Check that the page is loaded due to a postback:
if (IsPostBack)
{
// Check that the page passed validation:
if (IsValid)
{
// perform some logic...
}
}
}
Then if fill txtTest1 and click on btnValidate1 IsValid return false! because Validate() checks all of validations.
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