Custom Gridview Column

Question

I am a starter with C# . I am in trouble and hope to have the help from you all for the problem in which :

I do not know what this object is and how to create it in gridview for Columntype  ( Picture above ): ( It seems both a textbox and a button is in a textbox  . When you focus it , it shows as a textbox with a button in the right hand . And it is textbox only if lostfocus )

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