I want to add rows to child grid on a button click

Question

by using the add button im trying to add rows to child grid view like this   

protected void Add(object sender, EventArgs e)

{

GridViewRow row = (GridViewRow)((ImageButton)sender).Parent.Parent;

GridView gv = (GridView)row.FindControl("Gridview1");

DataTable dt = new DataTable();

DataRow dr = null;

dt.Columns.Add(new DataColumn("EmployeeKey", typeof(int)));

dt.Columns.Add(new DataColumn("tbName", typeof(string)));

dt.Columns.Add(new DataColumn("tbAmount", typeof(string)));

dt.Columns.Add(new DataColumn("tbEffDate", typeof(string)));

dr = dt.NewRow();

dr["EmployeeKey"] = gr.Cells[1].Text;

dr["tbName"] = string.Empty;

dr["tbAmount"] = string.Empty;

dr["tbEffDate"] = string.Empty;

dt.Rows.Add(dr);

ViewState["CurrentTable"] = dt;

gv.DataSource = dt;

gv.DataBind();

}

 

 

but its not working out child grid is not updating with rows can any body help 

 

 

here is the source code

 

<asp:GridView ID="gvEmpDetails" runat="server" AutoGenerateColumns="False"

ShowHeader="true" DataKeyNames="EmployeeKey" AllowPaging="true"

PageSize="5" ForeColor="#333333" GridLines="None"

onpageindexchanging="gvEmpDetails_PageIndexChanging"

Width="80%" OnRowDataBound="gvEmpDetails_RowDataBound" OnRowCommand="gvEmpDetails_RowCommand" >

<AlternatingRowStyle BackColor="White" ForeColor="#284775" />

<Columns>

<asp:TemplateField ItemStyle-BorderStyle="None" HeaderText="S.No" ItemStyle-Font-Bold="true">

<ItemTemplate>

<%# Container.DataItemIndex + 1 %>

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField="EmployeeKey" HeaderText="EmployeeKey" HtmlEncode="true" />

<asp:BoundField DataField="EmployeeID" HeaderText="Employee ID" HtmlEncode="true" />

<asp:BoundField DataField="EmpName" HeaderText="Employee Name" HtmlEncode="true" />

<asp:TemplateField ItemStyle-BorderStyle="None" HeaderText="Add" ItemStyle-Font-Bold="true">

<ItemTemplate>

<asp:ImageButton ID="ibAdd" OnClick="Add" ImageUrl="~/Images/6-32.png" runat="server" />

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

<HeaderTemplate>

<table style="width:100%">

<tr>

<td>Name</td>

<td>Amount</td>

<td>Effective Date</td>

</tr>

</table>

</HeaderTemplate>

<ItemTemplate>

<asp:GridView ID="gvEmpAllDetails" runat="server" ShowHeader="false" Width="70%"

ForeColor="#333333" GridLines="None" AutoGenerateColumns="false">

<AlternatingRowStyle BackColor="White" ForeColor="#284775" />

<Columns>

<asp:TemplateField ItemStyle-Horizontal>

<ItemTemplate>

<asp:TextBox ID="tbName" Text='<%# Eval("tbName") %>' runat="server"></asp:TextBox>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField ItemStyle-Horizontal>

<ItemTemplate>

<asp:TextBox ID="tbAmount" Text='<%# Eval("tbAmount") %>' runat="server"></asp:TextBox>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField ItemStyle-Horizontal>

<ItemTemplate>

<asp:TextBox ID="tbEffDate" Text='<%# Eval("tbEffDate") %>' onkeypress="return false" runat="server"></asp:TextBox>

<asp:CalendarExtender ID="ceEffDate" TargetControlID="tbEffDate" Format="dd-MMM-yyyy" runat="server"></asp:CalendarExtender>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField ItemStyle-HorizontalAlign="Right">

<ItemTemplate>

<asp:ImageButton ID="ibRemove" ImageUrl="~/Images/list_remove.png" runat="server" />

</ItemTemplate>

</asp:TemplateField>

</Columns>

<EditRowStyle BackColor="#999999" />

<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />

<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" Horizontal ForeColor="White" />

<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />

<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />

<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />

<SortedAscendingCellStyle BackColor="#E9E7E2" />

<SortedAscendingHeaderStyle BackColor="#506C8C" />

<SortedDescendingCellStyle BackColor="#FFFDF8" />

<SortedDescendingHeaderStyle BackColor="#6F8DAE" />

</asp:GridView>

</ItemTemplate>

</asp:TemplateField>

</Columns>

<EditRowStyle BackColor="#999999" />

<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />

<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" Horizontal ForeColor="White" />

<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />

<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />

<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />

<SortedAscendingCellStyle BackColor="#E9E7E2" />

<SortedAscendingHeaderStyle BackColor="#506C8C" />

<SortedDescendingCellStyle BackColor="#FFFDF8" />

<SortedDescendingHeaderStyle BackColor="#6F8DAE" />

</asp:GridView>