Fire Dropdownlist In Gridview Row When Edit Button Is Clicked

jamess

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User: jamess
Posted: on May 16, 2016 05:15 AM
Forum: Data Controls
Answer: 1
Views: 5007
Sample Code: Download

Hi,

I have a dropdownlist in gridview edit row. The dropdownlist only works when i select any item which ofcourse is the normal behaviour but my requirement is for it to fire with the current value and behaviour once i click edit button.

it should act as if it's a new selection but it should retain current value.

I don't know if i should call it reload or refresh

Below is the dropdown code:

Protected Sub TaxnameDrp_SelectedIndexChanged(sender As Object, e As EventArgs)
        Dim strConnString As String = ConfigurationManager.ConnectionStrings("ConnString").ConnectionString()
        Dim TaxnameDrp As DropDownList = DirectCast(sender, DropDownList)
        Dim TaxName As String = TaxnameDrp.SelectedValue

        ' Get the GridViewRow in which this master DropDownList exists
        Dim row As GridViewRow = DirectCast(TaxnameDrp.NamingContainer, GridViewRow)
        Dim txt As TextBox = DirectCast(row.FindControl("txtTaxamt2"), TextBox)
        Dim stotal As TextBox = DirectCast(row.FindControl("txtSubtotal2"), TextBox)
        Dim strQuery As String = "select TaxID, TaxName, [Rate(%)] from Tax where" & " TaxID = @TaxID"

        Dim con As New SqlConnection(strConnString)

        Dim cmd As New SqlCommand()
        cmd.Parameters.AddWithValue("@TaxID", TaxnameDrp.SelectedItem.Value)

        
        cmd.CommandType = CommandType.Text

        cmd.CommandText = strQuery

        cmd.Connection = con

        Try

            con.Open()

            Dim sdr As SqlDataReader = cmd.ExecuteReader()

            While sdr.Read()


                txt.Text = Convert.ToDecimal(Math.Round(sdr(2).ToString() * stotal.Text.Trim()) / 100).ToString("N2", CultureInfo.CreateSpecificCulture("en-US"))

                hdfTaxName.Value = sdr(2).ToString()

            End While

        Catch ex As Exception

            Throw ex

        Finally


            con.Close()
            con.Dispose()

        End Try

    End Sub

Thanks in advance

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dharmend...

0 9

Reply
ANSWER
User: dharmendr
Replied: on May 17, 2016 02:54 AM
Modified: on Sep 15, 2017 03:45 AM
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Hi jamess,

Here i have created sample as per your requirement. You need to change the code as per your requirement. Here i have used a label msg to show you the value is assigned to the hidden field.

HTML

<div>
    <asp:GridView ID="GView" runat="server" AutoGenerateColumns="False" AllowPaging="true"
        OnRowDataBound="RowDataBound" PageSize="5" EmptyDataText="No record found">
        <Columns>
            <asp:TemplateField HeaderText="Tax Name">
                <ItemTemplate>
                    <asp:Label ID="lblTaxname" runat="server" Text='<%# Eval("TaxID")%>'></asp:Label>
                    <asp:DropDownList ID="TaxnameDrp" runat="server" Width="80" />
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:Label ID="lblTaxname" runat="server" Text='<%# Eval("TaxID")%>' Visible="false"></asp:Label>
                    <asp:DropDownList ID="TaxnameDrp" runat="server" Width="80" />
                </EditItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Action">
                <ItemTemplate>
                    <asp:ImageButton ID="BtnEdit" runat="server" CommandName="Edit" ImageUrl="~/images/edit_new.png"
                        OnClick="OnEdit" CommandArgument='<%# Container.DataItemIndex %>' AlternateText="Edit" />
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:LinkButton ID="LinkButton2" Text="Update" runat="server" />
                    <asp:LinkButton ID="LinkButton3" Text="Cancel" runat="server" />
                </EditItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:HiddenField ID="hdfTaxName" runat="server" />
    <asp:Label ID="msg" runat="server" />
</div>

Code

Protected Sub Page_Load(sender As Object, e As EventArgs)
	If Not IsPostBack Then
		BindGrid()
	End If
End Sub

Private Function GetData(query As String) As DataTable
	Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings(1).ConnectionString)
	Dim cmd2 As New SqlCommand(query, con)
	Dim da As New SqlDataAdapter(cmd2)
	Dim dt As New DataTable()
	da.Fill(dt)
	Return dt
End Function

Private Sub BindGrid()
	Dim dt As DataTable = GetData("SELECT * FROM Tax")
	GView.DataSource = dt
	GView.DataBind()
End Sub

Protected Sub RowDataBound(sender As Object, e As GridViewRowEventArgs)
	If e.Row.RowType = DataControlRowType.DataRow Then
		Dim query2 As String = "SELECT TaxID,TaxName + ' ' +  Rate + '%'  AS Name FROM Tax"
		Dim dt As DataTable = GetData(query2)
		Dim drTaxname As DropDownList = DirectCast(e.Row.FindControl("TaxnameDrp"), DropDownList)
		drTaxname.DataSource = dt
		drTaxname.DataTextField = "Name"
		drTaxname.DataValueField = "TaxID"
		drTaxname.DataBind()
		drTaxname.Items.FindByValue(TryCast(e.Row.FindControl("lblTaxname"), Label).Text).Selected = True
	End If
End Sub

Protected Sub OnEdit(sender As Object, e As EventArgs)
	Dim ib As ImageButton = TryCast(sender, ImageButton)
	GView.EditIndex = Convert.ToInt32(ib.CommandArgument) Mod GView.PageSize
	Dim ddl As DropDownList = TryCast(ib.NamingContainer.FindControl("TaxnameDrp"), DropDownList)
	hdfTaxName.Value = ddl.SelectedItem.Text.Split(" "C)(ddl.SelectedItem.Text.Split(" "C).Length - 1).Replace("%", String.Empty).Trim()
	BindGrid()
	msg.Text = hdfTaxName.Value
End Sub

Screenshot

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Fire Dropdownlist In Gridview Row When Edit Button Is Clicked

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