Click on the relevant Web Part -> Right Side -> Click on Hyperlink
Keep in mind EACH WebPart has a separate Data Source Field, Filter and Sort Settings !
First Create a New Parameter value based on a Query String Variable.
Next set the DVWP Filter settings
The result is that the data in DVWP will be filtered on load, by the Query String variable.
Second Example is to Filter a DVWP based on a Field value.
Based on the Query String Parameter you can filter the detail list web part for the items added.
It will look like this. There is some garbage appearing on top of the DVWP ?
Just open the Form again in SP Designer and comment out that section to get rid of it.
<!-- <tr> <td width="25%" class="ms-vb"> <b>File Type:</b> </td> ..... <xsl:value-of select="@HTML_x0020_File_x0020_Type.File_x0020_Type.mapico"/> </td> </tr> -->
Look in the code for <!—…. –>
Filtering is quite handy !