[تنبيه - عنوان غير مناسب : ]ارجوكوا اريد مساعدة خاصة بال asp.net

<%@ Page Title="Dentist" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Dentist.aspx.cs" Inherits="WebApplication1._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
    <style type="text/css">

        .style7
        {
            font-size: x-large;
        }
    .style8
    {
        text-decoration: underline;
        font-size: xx-large;
    }
        .style10
        {
            font-size: medium;
        }
    </style>
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <strong><span class="style7">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    </span><span class="style8">Dentist</span></strong><br />
    <br />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        AllowPaging="True" DataKeyNames="d_id" DataSourceID="SqlDataSource1" 
        onselectedindexchanged="GridView1_SelectedIndexChanged" Width="459px" 
        AllowSorting="True" BackColor="#CCCCCC" BorderColor="#999999" 
    BorderStyle="Solid" BorderWidth="3px" CellPadding="4" CellSpacing="2" 
    ForeColor="Black" AutoGenerateDeleteButton="True" 
        AutoGenerateEditButton="True">
        <Columns>
            <asp:BoundField DataField="d_id" HeaderText="ID" ReadOnly="True" 
                SortExpression="d_id" />
            <asp:BoundField DataField="d_name" HeaderText="Name" 
                SortExpression="d_name" />
            <asp:BoundField DataField="d_phone" HeaderText="Phone" 
                SortExpression="d_phone" />
            <asp:BoundField DataField="d_address" HeaderText="Address" 
                SortExpression="d_address" />
            <asp:CommandField ShowSelectButton="True" />
        </Columns>
        <FooterStyle BackColor="#CCCCCC" />
        <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalAlign="Left" />
        <RowStyle BackColor="White" />
        <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#F1F1F1" />
        <SortedAscendingHeaderStyle BackColor="#808080" />
        <SortedDescendingCellStyle BackColor="#CAC9C9" />
        <SortedDescendingHeaderStyle BackColor="#383838" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ ConnectionStrings:DentistryConnectionString %>" 
    SelectCommand="SELECT * FROM [Dentist]" ConflictDetection="CompareAllValues" 
        DeleteCommand="DELETE FROM [Dentist] WHERE [d_id] = @original_d_id AND [d_name] = @original_d_name AND [d_phone] = @original_d_phone AND (([d_address] = @original_d_address) OR ([d_address] IS NULL AND @original_d_address IS NULL))" 
        InsertCommand="INSERT INTO [Dentist] ([d_id], [d_name], [d_phone], [d_address]) VALUES (@d_id, @d_name, @d_phone, @d_address)" 
        OldValuesParameterFormatString="original_{0}" 
        UpdateCommand="UPDATE [Dentist] SET [d_name] = @d_name, [d_phone] = @d_phone, [d_address] = @d_address WHERE [d_id] = @original_d_id AND [d_name] = @original_d_name AND [d_phone] = @original_d_phone AND (([d_address] = @original_d_address) OR ([d_address] IS NULL AND @original_d_address IS NULL))">
    <DeleteParameters>
        <asp:Parameter Name="original_d_id" Type="Int32" />
        <asp:Parameter Name="original_d_name" Type="String" />
        <asp:Parameter Name="original_d_phone" Type="String" />
        <asp:Parameter Name="original_d_address" Type="String" />
    </DeleteParameters>
    <InsertParameters>
        <asp:Parameter Name="d_id" Type="Int32" />
        <asp:Parameter Name="d_name" Type="String" />
        <asp:Parameter Name="d_phone" Type="String" />
        <asp:Parameter Name="d_address" Type="String" />
    </InsertParameters>
    <UpdateParameters>
        <asp:Parameter Name="d_name" Type="String" />
        <asp:Parameter Name="d_phone" Type="String" />
        <asp:Parameter Name="d_address" Type="String" />
        <asp:Parameter Name="original_d_id" Type="Int32" />
        <asp:Parameter Name="original_d_name" Type="String" />
        <asp:Parameter Name="original_d_phone" Type="String" />
        <asp:Parameter Name="original_d_address" Type="String" />
    </UpdateParameters>
    </asp:SqlDataSource>
    <br />
    <span class="style10"> <a href="Ask.aspx" class="style9">Click Here To See Dentist Names and Citizens Who are Treated</a></span><br />
    <br />
    ID&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <br />
    Name&nbsp;&nbsp;&nbsp; : <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    <br />
    address : <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
    <br />
    phone&nbsp;&nbsp; : <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
    <br />
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Enter Your Data" />
&nbsp; 
    <asp:Button ID="Button2" runat="server" onclick="Button2_Click2" 
        Text="Clear All" />
&nbsp;&nbsp;&nbsp;  
</asp:Content>