big problem by edit and delete rows from datagreadeview

Question

 hi my dear friends,i create a project by visual studio 2012 and now im have two problem white this project:

 

1) when i select a row from datagreadeview and press delete button the rows are delete but not delete from database(my database is access) and my curent code for this button:

 -------------------------------------

private void hazf_Click(object sender, EventArgs e)

{

if (this.dataGridView1.SelectedRows.Count > 0)

{

dataGridView1.Rows.RemoveAt(this.dataGridView1.SelectedRows[0].Index);

}

}

----------------------------------------

 

2) when i select a row from datagradeview and press edit button,im going into edit form and im edit the data,but when i press the save button my row is edited and saved but by a big problem,my all rows change to edited row!

my code for edit button in edit form:

-----------------------------------------------------

private void button1_Click(object sender, EventArgs e)

{

oleDbCommand1.Parameters.Clear();

oleDbCommand1.CommandText = "UPDATE ssbm SET name=@n,family=@f,shparvande=@s,tell=@t,kolebedehi=@k,harghest=@h,aghsatemoavagh=@a,mablaghemoavagh=@m,bishtar=@b";

oleDbCommand1.Parameters.AddWithValue("@n", txtProNet1.Text);

oleDbCommand1.Parameters.AddWithValue("@f", txtProNet2.Text);

oleDbCommand1.Parameters.AddWithValue("@s", txtProNet3.Text);

oleDbCommand1.Parameters.AddWithValue("@t", txtProNet4.Text);

oleDbCommand1.Parameters.AddWithValue("@k", txtProNet5.Text);

oleDbCommand1.Parameters.AddWithValue("@h", txtProNet6.Text);

oleDbCommand1.Parameters.AddWithValue("@a", txtProNet7.Text);

oleDbCommand1.Parameters.AddWithValue("@m", txtProNet8.Text);

oleDbCommand1.Parameters.AddWithValue("@b", richTextBox1.Text);

oleDbConnection1.Open();

oleDbCommand1.ExecuteNonQuery();

oleDbConnection1.Close();

MessageBox.Show("saved!");

fedit.ActiveForm.Close();

}

 ----------------------------------------------

please help me,tanx