I TRIED TO POPULATE DATA FROM DATABASE INTO THE COMBO BOX AND. ... USING COMBOBOX TO RETRIEVE DATA FROM THE DATABASE AND DISPLAY IT IN TEXTBOX. Im using Vb.net with Acess database Please tell me how to do this.

You need to get data from DB into dataset and assign that dataset to combobox as datasource and set the Displaymember and Value member of the combobox. Then in selected index changed event of the combobox get the value upon which you want to get the data from DB and write appropriate Query..