Simulate Form Post in VBNet with Webrequest

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Sorry, if my question is not posed properly but I am very new to this. I am trying to find out how to do a Post in VBNet using a Webrequest to access a report from our company's website. If you do it through Internet Explorer on the website, you get a form where you select your parameters and hit run to get the report. From the Java script, I can see the form name is "Form1" and I used Fiddler to see the parameters being sent for the report which looks like:
dirty=false&Delete=&Copy=&Save=&Reload=&FilterSetKey=0&txtSetDescription=&HDNTXT_29_5=&HDNTXT_28_4=&HDNTXT_33_3=&HDNTXT_34_3=&HDNTXT_35_3=&HDNTXT_36_9=&HDNTXT_60_3=&HDNTXT_39_7=&HDNTXT_37_7=&HDNTXT_38_7=&HDNTXT_40_3=&HDNTXT_41_3=&HDNTXT_42_3=&HDNTXT_44_3=2&HDNTXT_45_3=4%7E5%7E6&HDNTXT_46_3=&HDNTXT_47_9=&HDNTXT_27_2=01-Dec-2013&HDNTXT_20_8=1&HDNTXT_22_8=1&HDNTXT_21_8=1&DefaultFilter=No

And the address used for the post is similar to:
https://mycompanywebsite.com/apps/la/Reports/ExportDocument11.asp?ID=739&Request=Card&OpenType=Edit

Can anyone tell me how I can do a Form post from VBnet with these report parameters? Or point me to a good tutorial since I have not been able to find one. Thanks!

Posted 1-Dec-13 14:43pm

jo106n

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Sergey Alexandrovich Kryukov 1-Dec-13 21:00pm

You don't need a tutorial, this is one relatively small piece of knowledge. Did you read documentation on HttpWebRequest?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-12-01T15:11:00

Solution 1

The idea is pretty simple. First, read the documentation on the class :
http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest%28v=vs.110%29.aspx[^].

You simply need to use the method "POST" and write your post data in the request stream.

All the tutorial you might need is contained in a single MSDN page: http://msdn.microsoft.com/en-us/library/debx8sh9.aspx[^].

You can find some simple code samples here:
http://stackoverflow.com/questions/14702902/post-form-data-using-httpwebrequest[^],
http://bytes.com/topic/net/answers/426387-form-post-via-httpwebrequest[^],
http://technet.rapaport.com/info/lotupload/samplecode/full_example.aspx[^].

—SA

Posted 1-Dec-13 15:11pm

Sergey Alexandrovich Kryukov

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jo106n 3-Dec-13 21:24pm

Thanks Sergey. The one link to sample code was helpful. But according to Fiddler, I am getting an error under Transport of "Expect: 100-Continue". Trying to research but not sure how to get around. Would it be because I am using .asp?ID=739&Request=Card&OpenType=Edit in my webrequest address? I tried taking that out and adding the ID=739, Request=Card, and Type=Edit in the post but that causes a run time error.

Sergey Alexandrovich Kryukov 3-Dec-13 22:17pm

This detail doesn't tell me much. One of the ideas is this: start with doing it in some browser and make sure the request works. Use some HTML spy program to see what it does. Try to reproduce all the detail.
—SA