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I recently encountered a problem where a value was null if accessed with Request.Form but fine if retrieved with Request.Params. What are the differences between these methods that could cause this?
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Form the data is posted in http header whereas in QueryString data is sent through url. Request. Form is used for accessing the value on post back of form and Request. QueryString is used for accessing the value passes in url as a parameter.
Form, the Web server parses the HTTP request body and returns the specified data. If your application requires unparsed data from the form, you can access it by calling Request. Form without any parameters. The QueryString collection retrieves the values of the variables in the HTTP query string.
Request.Form only includes variables posted through a form, while Request.Params includes both posted form variables and get variables specified as URL parameters.
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Request.Params contains a combination of QueryString, Form, Cookies and ServerVariables (added in that order).
The difference is that if you have a form variable called "key1" that is in both the QueryString and Form then Request.Params["key1"] will return the QueryString value and Request.Params.GetValues("key1") will return an array of [querystring-value, form-value].
If there are multiple form values or cookies with the same key then those values will be added to the array returned by GetValues (ie. GetValues will not return a jagged array)
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