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Nested gridview asp.net c# with expand and collapse example

In previous example we have already learn about nested gridview asp.net . Now, today we will learn nested gridview asp.net  with expand and collapse feature. Parent Gridview bind with country database table and child Gridview bind with State database table when we select any country. Child Gridview appeared according to country_id column like. Lets start to design parent GridView:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound">

<Columns>

<asp:TemplateField>
<ItemTemplate>
<a href="JavaScript:expandcollapse('<%# Eval("country_id") %>');">
<img src="plus.gif" border="0" id='img<%#Eval("country_Id") %>' />

</ItemTemplate>

</asp:TemplateField>
<asp:BoundField DataField="country_Id" HeaderText="Country Id" />
<asp:BoundField DataField="country_name" HeaderText="Country Name" />

</Columns>

</asp:GridView>
Here,
  1. AutoGenerateColumns="false" means, automatically generated columns will not display in the Gridview.
  2. OnRowDataBound="GridView1_RowDataBound" means, raise event after bind the parent gridview for next child gridview.
  3. Using template field we create a column in the gridview.
  4. ItemTemplate used for displaying data in the browser.
  5. Both anchor and image tag bind with the country_id using Eval method. Also call a javaScript method when we click on image. Script method define later in the post.
  6. Bind two column with table , now the design window look like
Nested gridview asp.net c# with expand and collapse example

Now, add nested Gridview  using Template field. Similarly again create columns for state table but remember that state table get from country_id so also take country_id inside the template field, see the code
<asp:TemplateField>
<ItemTemplate>
<tr>
<td colspan="100%">
<div id='<%# Eval("Country_Id") %>' style="display:none" />

<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="state_Id" HeaderText="State Id" />
<asp:BoundField DataField="state_name" HeaderText="State Name" />

</Columns>

</asp:GridView>

</td>

</tr>

</ItemTemplate>

</asp:TemplateField>
Here,
  1. Bind division with the country_Id and set display style as none so its not visible.
  2. GridView with two data Field that are state_Id and state_name.
Now the whole source code is :
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound">

<Columns>
<asp:TemplateField>
<ItemTemplate>
<a href="JavaScript:expandcollapse('<%# Eval("country_id") %>');">
<img src="plus.gif" border="0" id='img<%#Eval("country_Id") %>' />


</ItemTemplate>


</asp:TemplateField>
<asp:BoundField DataField="country_Id" HeaderText="Country Id" />
<asp:BoundField DataField="country_name" HeaderText="Country Name" />
<asp:TemplateField>
<ItemTemplate>
<tr>
<td colspan="100%">
<div id='<%# Eval("Country_Id") %>' style="display:none" />

<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="state_Id" HeaderText="State Id" />
<asp:BoundField DataField="state_name" HeaderText="State Name" />

</Columns>

</asp:GridView>

</td>


</tr>


</ItemTemplate>


</asp:TemplateField>

</Columns>


</asp:GridView>
</div>
</form>
Now, come to the javaScript function which is calling from anchor tag in first TemplateField. Now, copy this code and paste into your <Script> block.
<script>
function expandcollapse(name)
{
var div = document.getElementById(name);
var img = document.getElementById('img' + name);
if(div.style.display=='none')
{
div.style.display = "inline";
img.src = "minus.gif";
}
else
{
div.style.display = "none";
img.src = "plus.gif";
}}

</script>
Here,
  1. <Script> tag, which is include in <head> section
  2. expandcollapse is the function name in which we have a parameter named "name".
  3. parameter take country_id as a value
  4. we have two variable first is used for division which is hide in the second template field and second variable is used for image which is changed according to expand and collapse.
  5. display inline means state table open in the parent table boundary.
Now, come to the code file. The following code demonstrates how to bind  the GridView control with the DataSet also demonstrate how to wok with RowDataBound event.
public partial class Default21 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
bindgridview();

}

}

private void bindgridview()
{
SqlConnection con = new SqlConnection();
con.ConnectionString = ConfigurationManager.ConnectionStrings["btti"].ToString();
con.Open();
SqlCommand cmd = new SqlCommand("select * from [country]", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
GridView1.DataSource = ds;
GridView1.DataBind();

}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType==DataControlRowType.DataRow)
{
SqlConnection con = new SqlConnection();
con.ConnectionString = ConfigurationManager.ConnectionStrings["btti"].ToString();
con.Open();
GridView gv = (GridView)e.Row.FindControl("GridView2");
int countryid = Convert.ToInt32(e.Row.Cells[1].Text);
SqlCommand cmd = new SqlCommand("select * from [state] where country_id="+countryid, con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
gv.DataSource = ds;
gv.DataBind();

}
}
}

Here,
  1. First to bind the gridview with DataSet.
  2. In the RowDataBound event, first to check the selected row is DataRow.
  3. Now, find the nested gridview in the block and bind it with data source.

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