A potentially dangerous Request.Form value was detected from the client (Login1$txtUserName="<html>").
Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. To allow pages to override application request validation settings, set the requestValidationMode attribute in the httpRuntime configuration section to requestValidationMode="2.0". Example: <httpRuntime requestValidationMode="2.0" />. After setting this value, you can then disable request validation by setting validateRequest="false" in the Page directive or in the <pages> configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. For more information, see http://go.microsoft.com/fwlink/?LinkId=153133.Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (Login1$txtUserName="<html>").
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Insert the following lines in your web.config
<system.web>
<pages validateRequest="false">
</pages>
//If your using .NET 4.0 use the following attribute
<httpRuntime requestValidationMode="2.0" />
</system.web>
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