数据处理后清除控件 [英] Clearing controls after data manipulation

问题描述

我正在使用一个带有按钮的用户控件，该按钮触发一个事件以绑定Webform上的gridview ...

在单击Web窗体上的按钮并在gridview上发生某些过程之后，我希望gridview的可见性变为false....

但是执行的代码却不起作用..即代码执行没有问题，但是gridview仍然可见.....

这是背后的代码

I am using a user control which has a button in it which fires an event to bind a gridview which is on the webform...

After a button on a webform is clicked and certain process happens on the gridview I want that the gridview visibility becomes false....

However the code executed but it does''t work....i.e. the code executes without problems but the gridview is still visible.....

this is the code behind

Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
       btn = DirectCast(Search1.FindControl("btn_search"), Button)
       If btn IsNot Nothing Then
           AddHandler btn.Click, AddressOf Me.btn_Click
       End If
   End Sub

Protected Sub btn_deallocate_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn_deallocate.Click
       Dim bed_no As String
       Dim ejamaatId As String
       Dim no_rows As Integer

       'Getting the ejamaatId of the student against which the checkbox has been checked
       For Each gvrow_student As GridViewRow In gvw_search.Rows
           Dim cb As CheckBox = DirectCast(gvrow_student.FindControl("chk_student"), CheckBox)
           If cb IsNot Nothing Then
               If cb.Checked Then
                   ejamaatId = gvw_search.DataKeys(gvrow_student.RowIndex).Value.ToString()
                   bed_no = gvw_search.Rows(gvrow_student.RowIndex).Cells(7).Text.ToString()
                   Try
                       If con.State = ConnectionState.Open Then
                           con.Close()
                       End If
                       con.Open()
                       Dim cmd As New SqlCommand("spr_BedAllocation", con)
                       cmd.CommandType = CommandType.StoredProcedure
                       Dim modepar1 As New SqlParameter("@mode", "Deallocate-Bed")
                       cmd.Parameters.Add(modepar1)
                       cmd.Parameters.AddWithValue("@ejamaatID", ejamaatId)
                       cmd.Parameters.AddWithValue("@bed_no", bed_no)
                       cmd.Parameters.AddWithValue("@hostelID", 1)
                       no_rows = cmd.ExecuteNonQuery()
                       con.Close()

                   Catch ex As Exception

                   End Try

               End If
           End If
       Next

       'ClearControls()




       If no_rows > 0 Then
           'ClientScript.RegisterStartupScript(GetType(Page), "MsgScript", "alert('students deallocated successfully');", True)
           gvw_search.DataSource = Nothing
           gvw_search.DataBind()
           'If gvw_search.Rows.Count = 0 Then
           gvw_search.Visible = False
           btn_deallocate.Visible = False
           grid_div.Visible = False
           'End If
       End If



   End Sub

推荐答案

代码似乎还可以.

唯一的事情，请检查no_rows> 0条件是否为真
此外，检查page_load是否发生任何回发，并再次填充gridview.

否则，没有理由，gridview无法隐藏.

希望这会有所帮助.
欢呼

The code seems okay.

Only thing, check no_rows>0 condition is true
Moreover, check the page_load whether any postback occurs and the gridview is again populated.

Otherwise, there is no reason, gridview cannot be hidden.

Hope this helps.
cheers

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