VS 2015 - Variable Is Used Before It Has Been Assigned A Value

Apr 20, 2016

I was working on my homework, making a website obiously, but I have a small problem with the griedview. I wanted to add a button on the end of the row, but I receive some error notifications and warnings too...

Code:
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.UI.WebControls
Partial Class Search
Inherits System.Web.UI.Page
[Code] ....

There is this error too:

SeverityCodeDescriptionProjectFileLineSuppression State
ErrorBC30518Overload resolution failed because no accessible 'Add' can be called with these arguments:
'Public Overloads Sub Add(column As DataColumn)': Value of type 'ButtonField' cannot be converted to 'DataColumn'.
'Public Overloads Function Add(columnName As String) As DataColumn': Value of type 'ButtonField' cannot be converted to 'String'.GIPH:GIPSearch.aspx.vb31Active

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