Row edit,delete,update in grid view in asp.net using c#

Title: Edit,Delete,Update Data in Grid view in Asp.net using c#.net

Description:
As per previous articles we have seen how to export grid view data to excel in asp.net and how to bind data to drop down list in grid view.Now i would like to explain how to do edit,update in grid view using c#.Before going to start we have to set the grid view properties i:e(AutogenerateDeleteButton,AutogenerateEditButton,AutogenerateUpdateButton) to enable the auto generate Edit,Delete,Update buttons. The given example will show how to do the CRUD functionality on grid view data
Grid View properties:

<asp:GridView ID="GridView1" runat="server" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" AutoGenerateSelectButton="True">
</asp:GridView>

Bind the data to grid view:

//page load event
if(page.isPostback==false)
{
dataset ds=null;
ds=(dataset)session["ds1"];
//session will contain dataset ds1 with data selected by user
if(ds!=null)
{
gvemp.datasource=ds.Tables["employee"];
gvemp.DataBind();
}
}      

Row Editing:
When user clicks on edit button post backtakes place,row editing event of grid view will be executed.This event will provide row index

protected void gremp_rowediting(object sender,EventArgs e)
{
dataset ds=(dstaset)session["ds1"];
gvemp.editindex=e.new editindex;
//e.newedit index:- will be provide index of row for which edit button is selected
gvemp.Datasource=Ds.Table["employee"];
gvemp.Databind();
}

Row Updating:
This will perform post back,row-updating event procedure of grid view will be executed

protected void gvemp-rowupdating(Object sender,EvenArgs e)
{
Textbox txt=(Textbox)gvemp.Rows[e.RowIndex].cells[3].controls[0];
//here i will update the third cell data in grid view
int avg=int.parse(txt.Text);
Dataset ds=(dataset)session["ds1"]; 
ds.Tables["employee"].rows[e.Rowindex]["Average"]=avg;
ds.Tables["employee"].AcceptChanges();
session["Ds1"]=ds;
//it will overwrite the session of Dataset
//Rearrange Gridview
gvemp.editIndex=-1;
gvemp.Datasource=Ds.Tables["employee"];
gvemp.DataBind();
}

Row Deleting:
This will perform post back,row-deleting event procedure of grid view will be executed

protected void gvemp-rowdeleting(Object sender,EvenArgs e)
{
Dataset ds=(dataset)session["ds1"]; 
ds.Tables["employee"].rows[e.Rowindex].Delete();
ds.Tables["employee"].AcceptChanges();
session["Ds1"]=ds;
gvemp.Datasource=Ds.Tables["employee"];
gvemp.DataBind();
}