Let’s create a simple demonstration to understand the concept of making GridView Editable, Updateable, and Deleteable in a much better manner.

In order to see it practically, you just need to follow the following steps.

Step1: –Create a simple ASP.NET Web Application for that just open Visual Studio >> go to >> File >> New >> Project >> Web >> Select ASP.NET Empty Web Application.

Step2: - Now, simply just add a Web Form to your ASP.NET
Empty Web Application for that just go to >> Solution Explorer >> Right Click on the project name >> Add >> New Item >> Select Web Form.

Now, simply just drag and drop GridView to your Web Form and allow the below properties to true.

1. Allow AutoGenerateEditButton to True.

2. Allow AutoGenerateDeleteButton to True.

Now, as soon as you set the above two properties you will see the GridView like the below diagram.

Step3: - Now, let bind the GridView with Data for that just add the below
the code snippet into your WebForm.aspx.cs file.

        //Below variable holds the Connection String.
        string str = ConfigurationManager.AppSettings["Connect"];
 
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GridViewData();
            }
}
//Created a GridViewData method to bind data to GridView
        //from the SQL Server DataBase Table.
        public void GridViewData()
        {
            SqlConnection con = new SqlConnection(str);
            con.Open();
            SqlCommand com = new SqlCommand();
            com.CommandText = "select * from Book";
            com.Connection = con;
            com.ExecuteNonQuery();
            SqlDataAdapter adap = new SqlDataAdapter(com);
            DataSet ds = new DataSet();
            adap.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();
        }

 Step4: – This is the most important step while making GridView Editable, Updateable and Deletable.

Now, simply just add the below Events of the GridView control into your
Web Application.

1. OnRowEditing.

2. OnRowCancelingEdit.

3. OnRowUpdating.

4. OnRowDeleting.

Step5: - Now, just add the below code snippet to make necessary changes to the respective events of the GridView control.

1.       OnRowEditing adds the below code snippet.

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
        {
            GridView1.EditIndex = e.NewEditIndex;
            GridViewData();
       }

 2. OnRowCanelingEdit adds the below code snippet.

protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
        {
            GridView1.EditIndex = -1; GridViewData();
        }
 

  2.       OnRowDeleting adds the below code snippet.

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
       {
            //The below line of code will hold the Cells[1] data of th GridView Control.
            string id = GridView1.Rows[e.RowIndex].Cells[1].Text;
            SqlConnection con = new SqlConnection(str);
            con.Open();
            SqlCommand com = new SqlCommand();
            com.CommandText = "delete from Book where Book_Id = '"+id+"'";
            com.Connection = con;
            com.ExecuteNonQuery();
            GridViewData();
        }

 3.       OnRowUpdating adds the below code snippet.

        protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            string id = ((TextBox)GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text;
            string bookname = ((TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text;             string
author = ((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text;
string price = ((TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).Text;
string quantity = ((TextBox)GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).Text; SqlConnection
con = new SqlConnection(str); con.Open(); SqlCommand com = new SqlCommand();
com.CommandText = "update Book set Book_Name='" + bookname +
"',Book_Author='" + author + "',Book_Price='" + price +
"',Book_Quantity='" + quantity + "' where Book_Id= '" + id
+ "'"; com.Connection = con; com.ExecuteNonQuery(); GridViewData(); }

 Note: - You can modify your code according to your requirements.

Step6: - Now, let’s run your Web Application and see the respective results.

Let’s first see the result for deleting.

The above diagram is my output of the loaded GridView and note that I am going to delete the circled row data from the GridView control.

Now, as soon as you click on the delete link will see the result like below diagram.

In the above result of diagram you can see that the data has been deleted.

Similarly, let’s see the result for updating the below circled row data in the GridView control.

Now, as soon as you click on the edit link you will see something like below diagram.

Now, let’s modify the Book_Author Name as Kalim Shaikh and click on the Update link and see whether the data is updated or not.

In the above output diagram you can clearly see that now the Book_Author name is modified to Kalim Shaikh.

You should also read this Article - Select Insert Update and Delete using Stored Procedure in ASP.NET MVC4