The following screen will be clearly explain the requirement, First Product category need to select, based on the Product Category, Product Sub Category have to filter under Product Sub Category combo box, based on the Sub Category selection, all the product should be filler and display under product. Then the based on the selected product details should be display.
Before the coding:
Final Output after the coding:
The following picture shows the AutoPostBack option for a combo box:
The following Image displays about the connection string in “config” file
The C# code as following:
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