Follow these few steps below
* Switch to Design View in Visual Studio Designer
* Then Click on the GridView
* Click on the Smar-Tag of the Grid located at the Upper-Right corner
* Then Click Edit Columns, then a pop up window will appear
* Locate to the Selected Fields List (you can find there the list of columns in your Grid)
* Then You can now Select the Columns that you want to move by clicking on the Up and Down Arrows located right beside the List
* Then you are done