How to add and update a datagridview(code inside) ?

I want to programatically insert and updaet the small window application attached herewith.
I tried to do but didnt workout.View is properly working.

code http://rapidshare.com/files/353391227/WindowsApplication4.rar.html

Can anyone pls write the code for insert and update?

Thanks for helping

 

usinf edititem template of datagrid to update

 

Here is the sample code for updating..
protected void grvVideos_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
try
{
GridViewRow row = grvVideos.Rows[e.RowIndex];
if (row != null)
{
Label lblID = (Label)row.FindControl("lblID");
TextBox txtTitle = (TextBox)row.FindControl("txtNewTitle");
TextBox txtSubTitle = (TextBox)row.FindControl("txtNewSubTitle");
TextBox txtDescription = (TextBox)row.FindControl("txtNewDescription");
TextBox txtFileName = (TextBox)row.FindControl("txtNewFileName");
TextBox txtLink1 = (TextBox)row.FindControl("txtNewLink1");
TextBox txtLink2 = (TextBox)row.FindControl("txtNewLink2");
int id = int.Parse(lblID.Text.Trim());

string title = txtTitle.Text.Trim().Replace("'", "''");
string subtitle = txtSubTitle.Text.Trim().Replace("'", "''");
string description = txtDescription.Text.Trim().Replace("'","''");
string filename = txtFileName.Text.Trim();
string link1 = txtLink1.Text.Trim();
string link2 = txtLink2.Text.Trim();

Videos oVideos = new Videos();

bool VideoChanged = oVideos.UpdateVideos(id, title, subtitle, description, filename, link1, link2);
if (VideoChanged == true)
{
grvVideos.EditIndex = -1;
GetData();

}
}
}

 

TextBox txtTitle = ((TextBox)row.FindControl("txtNewTitle")).text;