retrieve list items from the textbox text value and display the dropdownlist item for that particular list item

Hi,

Since you have got the data you want with the help of SharePoint Object Model, then you can focus on how to populate values and set an option selected in the Drop Down List.

With the retrieved data, you can populate them into the Drop Down List firstly, then set a specific option selected.

Here is a link will show how to populate DropDownList control:

http://ift.tt/1s3exr1

Another link about select an item in DropDownList:

http://ift.tt/1v07dly

Best regards

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Patrick Liang

TechNet Community Support