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This is an error which is caused by posting html-code in a textbox. The text doesn't need to contain valid HTML, just anything with opening and closing angled brackets ("<...>").
The complete error:
Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.
Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (ctl00$mainContentPH$fvFaq$tbFaqBody_sv-SE="...the link <a href="http://www....").
Solution There are two ways to disable request validation.
string ColumnName = null; //error will be thrown if the variabe ColumnName is null if(ColumnName ==null) ColumnName=string.Empty; SqlParameter param = new SqlParameter("@ColumnName", SqlDbType.NVarChar, 100); param.Value = ColumnName; cmd.Parameters.Add(param); cmd.Execute();