Issue with the System.Web.HttpRequestValidationException

I've been grappling with an issue related to a week-long problem that involves the error message 

System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client
. This issue arises specifically when dealing with multiline textboxes. I attempted to resolve it by adding the property "Validation Request=false" in both the page header and web.config file, but unfortunately, this solution did not work as expected. Can someone please provide assistance? The challenge I am facing is related to saving the <span></span> tag using a multiline textbox into a database. This problem only occurs during this specific scenario, otherwise, the system functions correctly.

c#javascriptasp.nethttprequest

Answer №1

To configure your web.config file for proper request validation, include the following attribute within the httpruntime tag:

<httpRuntime requestValidationMode="2.0" />

Once this is done, ensure that validateRequest="false" is set under the pages tag as well:

<pages validateRequest="false">

Answer №2

Before storing your HTML in the database, it is recommended to encode it for security reasons.

To do this, you can use the following code snippet: Server.Encode(YourTextBoxId);

For instance, if your command looks like this:

cmd.Parameters.AddWithValue("@htmlcontent", TextBox1.Text);

You should modify it as follows:

cmd.Parameters.AddWithValue("@htmlcontent", Server.Encode(YourTextBoxId));

If your command is written like this:

cmd.Parameters.Add("@htmlcontent", SqlDbType.Text).Value = TextBox1.Text;

You need to replace it with:

cmd.Parameters.Add("@htmlcontent", SqlDbType.Text).Value = Server.HtmlEncode(TextBox1.Text);

By following these steps, you can ensure the safety of your data. Good luck!

Answer №3

To disable event validation, you can add EnableEventValidation="false" in the page directive of the affected page or in the web.config file.

However, it is recommended to proceed with caution as enabling this option may require additional measures to ensure the input is properly sanitized.

Best regards,

Si

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