Insert, Update and Detele in DataTable using C#.Net

Inserting, Deleting and Updating in DataTable is very important in the real senario, with out interation to database every time.
So first i am  creating a datatable in the pageload and this datatable is binded to gridview.
Before that declare static datatable globally as shown below

static DataTable dt;

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            dt = new DataTable();
            dt.Columns.Add("S.NO");
            dt.Columns.Add("Name");
            dt.Columns.Add("Sal");           
            for (int i = 0; i < 10; i++)
            {
                dr = dt.NewRow();
                dr["S.No"] = (1 + i);
                dr["Name"] = "Sample " + (i+1);
                dr["Sal"] = "27000";
                dt.Rows.Add(dr);
            }
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
    }



The GUI of the web page looks as shown below.

ADD
As shown in the above figure, There are 3 buttons for ADD, Update and delete.
Now in the ADD button click event write the folowing code, before that declare DataRow dr1 as globally.

        dr1 = dt.NewRow();
        dr1["S.NO"] = TextBox1.Text;
        dr1["Name"] = TextBox2.Text;
        dr1["Sal"] = TextBox3.Text;
        dt.Rows.Add(dr1);
        GridView1.DataSource = dt;
        GridView1.DataBind();
 
UPDATE 
Now in the update button click event write the following code to update Datatable,  before that declare globally a variable as DataEows[] rows;

        rows = dt.Select();
        for (int i = 0; i < rows.Length; i++)
        {
            if (i+1 == int.Parse(TextBox4.Text))
            {
                rows[i]["Name"] = TextBox5.Text;
                rows[i]["Sal"] = TextBox6.Text;
            }
        }
        GridView1.DataSource = dt;
        GridView1.DataBind();


Delete
Now in the Final button i.e., Delete button event write the following code to delete
         int val = (int.Parse(TextBox7.Text) - 1);
        dt.Rows.RemoveAt(val);
        GridView1.DataSource = dt;
        GridView1.DataBind();
And finally you can see all the 3 attempts as shown in the below figure

DownLoad Source Code from Here