Delete line from a grid (BD) website C #

Good,

I need a little help because I'm building a webpage where it shows the DB data in a Grid.

I put the Update button and delete.

I got through the web to make change to DB. But I'm having trouble deleting the line.

protected void ligabd()
{
    adpt = new tb_funcoesTableAdapter();
    tabfun = new DataSet.tb_funcoesDataTable();
    // tabfun = adpt.GetData();
    adpt.Fill(tabfun);
}

protected void enchegrid()
{
    Grid.DataKeyNames = new string[] { "Id" };
    Grid.DataSource = tabfun;
    Grid.DataBind();

}


protected void Grid_RowEditing(object sender, GridViewEditEventArgs e)
{
    Grid.EditIndex = e.NewEditIndex;
    enchegrid();
}

protected void Grid_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    Grid.EditIndex = -1;
    enchegrid();
}

protected void Grid_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    GridViewRow r = Grid.Rows[e.RowIndex];
    rfun = tabfun.FindById((int)Grid.DataKeys[e.RowIndex].Value);
    if (rfun != null)
    {
        rfun["funcao"] = ((TextBox)r.FindControl("txtfuncao")).Text;

    }
    Grid.EditIndex = -1;
    adpt = new tb_funcoesTableAdapter();
    adpt.Update(tabfun);
    adpt.Fill(tabfun);
    enchegrid();
} 

I leave here some of my code. Now I'm missing to create this one where it erases the complete line. I have the following code and it is giving error:

 protected void Grid_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    tb_funcoesTableAdapter.Customers.Rows[0].Delete();
    enchegrid();
}

Thanks for any help that makes me realize how I can delete the line at once.