使用ASP.NET C＃绑定数据时如何使用数据库刷新GridView

Question

I am using GridView and have bound to SQL in the frontend using asp.net. Before button_Click I make sure that the values of the my database table which is bound to GridView is reset, but it is not reflecting in the GridView after button_Click.

Here is my asp code for GridView :

<Columns>
    <asp:BoundField DataField="Profiles" HeaderText="Profiles" ReadOnly="true" SortExpression="Profiles" />
    <asp:BoundField DataField="Location_Profile" HeaderText="Location_Profile" SortExpression="Location_Profile" />
</Columns>

The datasource asp code is:

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:TouchPadConnectionString %>"
        InsertCommand="INSERT INTO [Loc_Pro_Grid] ([Profiles], [Location_Profile]) VALUES (@Profiles, @Location_Profile)"
        SelectCommand="SELECT * FROM [Loc_Pro_Grid]" 
        UpdateCommand="UPDATE Loc_Pro_Grid SET Location_Profile = @Location_Profile WHERE (Profiles = @Profiles)">
    <InsertParameters>
        <asp:Parameter Name="Profiles" Type="String" />
        <asp:Parameter Name="Location_Profile" Type="Int32" />
    </InsertParameters>
    <UpdateParameters>
        <asp:Parameter Name="Location_Profile" />
        <asp:Parameter Name="Profiles" />
    </UpdateParameters>
</asp:SqlDataSource>

My .cs code is:

 protected void Save_Click(object sender, EventArgs e)
    {

// I am doing some operations here then I am resetting the table as below

com = new SqlCommand("UPDATE Loc_Pro_Grid SET Location_Profile = 0 WHERE Profiles='" + ListBox1.Items[i].ToString() + "' ", con);
}
                    con.Open();
                    com.ExecuteNonQuery();
                    con.Close();   

Answer 1

call grdFoo.DataBind() on your button_Click Event.

protected void Save_Click(object sender, EventArgs e)
{
     // I am doing some operations here then I am resetting the table as below
      com = new SqlCommand("UPDATE Loc_Pro_Grid SET Location_Profile = 0 WHERE Profiles='" +        ListBox1.Items[i].ToString() + "' ", con);
      con.Open();
      com.ExecuteNonQuery();
      con.Close();   
      // Call DataGrid's bind method here..for example
      grdFoo.DataBind()
}

Answer 2

您可以调用GridView的DataBind方法来刷新网格。

Answer 3

如Mayak所示，您应该再次刷新和绑定数据，或者可以再次使用“更新”面板，“更新数据并绑定gridview 。