I am learning to program using C# . I'm using windows forms. How would I execute a stored query named "DuplicateQuery" using c# and windows forms?

This is the answer in VB.NET. You should be able to convert it to C# easily.

Dim cmd As New OleDbCommand("DuplicateQuery")
cmd.CommandType = CommandType.StoredProcedure
cmd.Connection = New OleDbConnection("Your Connection String")

'If you have any parameters in the query, you set them up like this
cmd.Parameters.Add("@Variable", OleDbType.VarChar).Value = DBNull.Value 'or the actul value

Dim ds As New DataSet
Dim da As New OleDbDataAdapter(cmd)
da.Fill(ds)