Gridview dynamically change rows

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<tr>
       <td align="left" class="label" style="height: 23px" valign="top">
           <asp:Label ID="lbl_Scale_pointers" runat="server" Text="Scale pointers"></asp:Label></td>
       <td align="left" class="label" style="width: 1px; height: 23px;" valign="top">
           :</td>
       <td align="left" class="control" style="height: 23px">
           <%--<cc1:DropDownListControl ID="ddlst_Scale_pointers" runat="server">
           </cc1:DropDownListControl>--%>
           <asp:DropDownList ID="ddlst_Scale_pointers" runat="server" AutoPostBack="True" Width="80px">
           <asp:ListItem>1</asp:ListItem>
           <asp:ListItem>2</asp:ListItem>
           <asp:ListItem>3</asp:ListItem>
           <asp:ListItem>4</asp:ListItem>
           <asp:ListItem>5</asp:ListItem>
           <asp:ListItem>6</asp:ListItem>
           <asp:ListItem>7</asp:ListItem>

           </asp:DropDownList>
       </td>
   </tr>
   <tr>
   <td align ="center" class="label" style="height: 23px" valign="top">
   <asp:Label ID="lblcolor" runat="server" Text="Please pick the color for Pointer"></asp:Label>
   </td>
   </tr>

   <tr>
  <%--<td align="center" class="label" style="height: 23px" valign="top">
         <asp:Label Visible="false" ID="Label1" runat="server" Text=""></asp:Label></td>

       <td align="center"  class="label" style="width: 1px; height: 23px;" valign="top">
           </td>--%>
  <td align="center" colspan="3"  class="control" style="height: 23px" valign="top"  >

  <asp:GridView  ID="grdvw1" EnableViewState="true" OnRowDataBound="grdvw1_RowDataBound" runat="server" Width="300px" CellSpacing="3" CellPadding ="3">


   <Columns>
           <asp:TemplateField HeaderText="Pointer No">
           <ItemTemplate>
           <asp:Label Text="" ID="lblPointerNo" runat="server" >
           </asp:Label>
           </ItemTemplate>
           </asp:TemplateField>
   </Columns>

   <Columns>
           <asp:TemplateField HeaderText="Pointer Color">
           <ItemTemplate>
           <asp:TextBox ID="txtcolor" runat="server" class="color" MaxLength="19" Width="200px"></asp:TextBox>
           </ItemTemplate>
           </asp:TemplateField>
   </Columns>

    </asp:GridView>

   </td>

   </tr>

VB

Protected Sub ddlst_Scale_pointers_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlst_Scale_pointers.SelectedIndexChanged
       BindGridview(ddlst_Scale_pointers.SelectedValue)
   End Sub
Sub BindGridview(ByVal rownum As Integer)
For i As Integer = 0 To rownum - 1   

    Dim lblTest As Label = CType(grdvw1.FindControl("lblPointerNo"), Label)
    lblTest.Text = i + 1 
    
Next

grdvw1.DataBind()
End sub

on selection of dropdownlist value i need number of rows for grid

I want to change the value of label dynamically that is if dropdwnlist has value 3 then the lblpionter no should display
1
2
3 in 3 diff rows so do any1 has the ans for this

Posted 11-Feb-13 23:57pm

Member 9410081

Updated 12-Feb-13 6:52am

Karthik Harve

v6

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Comments

PrachiMhatre 12-Feb-13 7:27am

Please clarify the requirement..

ZurdoDev 12-Feb-13 11:04am

Where are you stuck?

Karthik Harve 12-Feb-13 12:50pm

[Edit] pre tags added

1 solution

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*Karthik Harve* · Answer 1 · 2013-02-12T06:59:00

Solution 1

Hi,

change the gridview source as below.

ASP.NET

<columns>
    <asp:templatefield headertext="Pointer No" xmlns:asp="#unknown">
    <itemtemplate>
    <asp:label text='<%#Eval("PointerNo")%>' id="lblPointerNo" runat="server">
    </asp:label>
    </itemtemplate>
    </asp:templatefield>
</columns>

bind the gidview as below.

VB

Sub BindGridview(ByVal rownum As Integer)
Dim dt as New DataTable
dt.Columns.Add("PointerNo", Type.GetType(string))
dt.AcceptChanges()

For i As Integer = 0 To rownum - 1   
 dt.Rows.Add((i + 1).ToString())
 dt.AcceptChanges()
Next
 
grdvw1.DataSource = dt
grdvw1.DataBind()
End sub

option Two

keep the grid view source unchanged. add the below code in RowDataBoundEvent.

VB

Dim lbl as Label = CType(e.Row.FindControl("lblPointerNo"), Label)
If lbl IsNot  Nothing THEN
    IF e.Row.RowIndex < Convert.ToInt32(ddlst_Scale_pointers.SelectedValue) THEN
        lbl.Text = (e.Row.RowIndex + 1).ToString();
    End If
End If

hope it helps

Posted 12-Feb-13 6:59am

Karthik Harve

Updated 12-Feb-13 22:55pm

v4

Comments

Member 9410081 13-Feb-13 1:28am

I am not able to get the values in label

Karthik Harve 13-Feb-13 1:31am

did you added the Eval function in gridview source ?

Member 9410081 13-Feb-13 1:40am

NO

Member 9410081 13-Feb-13 1:41am

ya i have added

Karthik Harve 13-Feb-13 3:31am

what is the error message ?

Member 9410081 13-Feb-13 3:59am

use new keyword

Member 9410081 13-Feb-13 4:01am

the control is gettin added as last colmn and i want it as first 1

Karthik Harve 13-Feb-13 4:20am

check with option two in updated answer.

Member 9410081 13-Feb-13 4:52am

it giving error <> sign

Karthik Harve 13-Feb-13 4:56am

ya. its my mistake. check updated one.

Member 9410081 13-Feb-13 5:08am

Object reference not set to an instance of an object.

Karthik Harve 13-Feb-13 5:13am

check this condition before that code.

If e.Row.RowType = DataControlRowType.DataRow Then
End If

so, that should be as below.

If e.Row.RowType = DataControlRowType.DataRow Then
Dim lbl as Label = CType(e.Row.FindControl("lblPointerNo"), Label)
If lbl IsNot Nothing THEN
IF e.Row.RowIndex < Convert.ToInt32(ddlst_Scale_pointers.SelectedValue) THEN
lbl.Text = (e.Row.RowIndex + 1).ToString();
End If
End If
End If

Karthik Harve 13-Feb-13 5:34am

If go with option two, no need to use that new column "PointerNo" and page source also you can keep unchanged. only RowDataBoundEvent will have that code to change the label text based on the row index.

Karthik Harve 13-Feb-13 6:27am

In that function, create one datatable with row count equal to dropdownlist selected value. and bind gridview with that datatable.

Karthik Harve 13-Feb-13 7:19am

bindgridview

Karthik Harve 13-Feb-13 12:54pm

did you bind the gridview with that datatable ? still not working ?

Member 9410081 13-Feb-13 23:42pm

what about the eval function?

Karthik Harve 14-Feb-13 0:07am

remove Eval function.

Member 9410081 13-Feb-13 23:54pm

What chages shuld i do over here
Sub BindGridview(ByVal rownum As Integer)
Dim dt as New DataTable
dt.Columns.Add("PointerNo", Type.GetType(string))
dt.AcceptChanges()

For i As Integer = 0 To rownum - 1
dt.Rows.Add((i + 1).ToString())
dt.AcceptChanges()
Next

grdvw1.DataSource = dt
grdvw1.DataBind()
End sub

Karthik Harve 14-Feb-13 0:14am

ya, its fine.

Karthik Harve 14-Feb-13 2:06am

The datatable does not add new column to gridview. it will just create the rows for the gridview.

Member 9410081 14-Feb-13 3:53am

ok
But the below code creates new column

dt.Columns.Add("PointerNo", Type.GetType(string))
dt.AcceptChanges()

For i As Integer = 0 To rownum - 1
dt.Rows.Add((i + 1).ToString())
dt.AcceptChanges()
Next

Karthik Harve 14-Feb-13 4:11am

Its just a dummy column, to know the number of rows for the gridview.