如何使用SQL命令缩短代码

我的问题是:我想让我的代码简短，我的一个朋友告诉我，我可以使用DAL。但是我不知道如何使用DAL。我也试着上网搜索。但事实并非如此给我一些简单的解决办法。我是使用DAL的新手

注意:我知道我的select命令很短，但是把它想象成一个大量的数据。

ASPX代码/strong>

<div>
    <div>
        <asp:Label ID="lbl1" Text="FirstName" runat="server" />
    </div>
    <div>
        <asp:TextBox ID="txtFName" runat="server" />
    </div>            
    <div>
        <div>
            <asp:Label ID="lbl2" Text="MiddleName" runat="server" />
        </div>
        <div>
            <asp:TextBox ID="txtMName" runat="server" />
        </div>
    </div>
    <div>
        <div>
            <asp:Label ID="lbl3" Text="LastName" runat="server" />
        </div>
        <div>
            <asp:TextBox ID="txtLName" runat="server" />
        </div>
    </div>
    <div>
        <div>
            <asp:Label ID="lbl4" Text="Birthday" runat="server" />
        </div>
        <div>
            <asp:TextBox ID="txtBday" runat="server" />
        </div>
    </div>
    <div>
        <div>
            <asp:Label ID="lbl5" Text="Address" runat="server" />
        </div>
        <div>
            <asp:TextBox ID="txtAdd" runat="server" />
        </div>
    </div>
</div>

protected void Page_Load(object sender, EventArgs e)
{
    SelectCommand();
}
private void SelectCommand()
{
    SqlCommand sqlSelect = new SqlCommand();
    sqlSelect.Connection = conn;
    sqlSelect.CommandText = "select FirstName = @FirstName,MiddleName = @MiddleName,LastName = @LastName,BirthDate = @BirthDate, Address = @Address from User";
    sqlSelect.CommandType = CommandType.Text;
    sqlSelect.Parameters.AddWithValue("@FirstName", txtFName.Text);
    sqlSelect.Parameters.AddWithValue("@MiddleName", txtFName.Text);
    sqlSelect.Parameters.AddWithValue("@LastName", txtFName.Text);
    sqlSelect.Parameters.AddWithValue("@BirthDate", txtBday.Text);
    sqlSelect.Parameters.AddWithValue("@Address", txtAdd.Text);
    conn.Open();
    sqlSelect.ExecuteNonQuery();
    conn.Close();
}