如何从ListBox中删除数据库条目？

Question

我需要帮助从列表框中删除帮助。如何在列表框中选择项目并单击删除按钮，如何在sql数据库中删除此项目？

以下是数据从数据库中读取的位置：

DataTable aucTable = new DataTable();
SqlConnection conn = new SqlConnection(@"Data Source=localhost\SQLEXPRESS;Initial Catalog=AuctionBase;Integrated Security=True");
SqlDataAdapter aucDa = new SqlDataAdapter("SELECT * FROM Auction", conn);

aucDa.Fill(aucTable);

listBox1.DataContext = aucTable;

查看数据的xaml代码：

GridView ColumnHeaderToolTip="Auction"
 GridViewColumn DisplayMemberBinding="{Binding Path=Product}" Header="Product" Width="150"
 GridViewColumn DisplayMemberBinding="{Binding Path=StartingPrice}"  Header="Starting Price" Width="120"
 GridViewColumn DisplayMemberBinding="{Binding Path=CurrentPrice}"  Header="Current Price" Width="120"
</GridView>

数据库：

CREATE TABLE Auction
(
    AuctionID int IDENTITY(1,1) NOT NULL PRIMARY KEY,
    Product nvarchar(20) NOT NULL,
    StartingPrice int NOT NULL,
    CurrentPrice int NOT NULL 
);

删除按钮：

if(listBox1.SelectedIndex < 0)
{
    return;
}
else
{ 
    SqlConnection conn = new SqlConnection(@"Data Source=localhost\SQLEXPRESS;Initial Catalog=AuctionBase;Integrated Security=True");
    SqlDataAdapter aucDel = new SqlDataAdapter();
    SqlCommand delete = new SqlCommand("DELETE FROM Auction WHERE AuctionID = @AuctionID", conn);
    try
    {
        conn.Open();
        delete.EndExecuteNonQuery();
        conn.Close();
    }
}

我错了什么，解决方案是什么？我希望在单击删除按钮时，应删除ListBox中的选定项目。