افزودن کلیدهای درج و حذف به فرم #C در پایگاه داده Access

I send delete funection and insert funection

string strcon;
string strsql;
OleDbConnection con;
OleDbDataAdapter da;
DataSet ds=new DataSet();
//************************************************** *****
private void Form1_Load(object sender, System.EventArgs e)
{
strcon="Provider=Microsoft.Jet.OLEDB.4.0;"+"Data Source=d:\\db2\\db1.mdb";
con=new OleDbConnection(strcon);
con.Open();
strsql="Select * from db";
da=new OleDbDataAdapter(strsql,con);
da.Fill(ds,"db");
dataGrid1.DataBindings.Add(new Binding("DataSource",ds,"db"));
con.Close();
}
//************************************************** *****
private void Delete_Click(object sender, System.EventArgs e)
{
string strdel;
string strnum;
strnum=textBox1.Text;
OleDbCommand cmd=new OleDbCommand();
con.Open();
strdel="Delete from db where NUM="+strnum;
cmd.CommandText=strdel;
cmd.Connection=con;
cmd.ExecuteNonQuery();
ds.Clear();
da.Fill(ds,"db");
con.Close();
}
//**************************************************
private void Insert_Click(object sender, System.EventArgs e)
{
string strins;
string strnum;
string strname;
int num;
OleDbCommand cmd=new OleDbCommand();
con.Open();
strnum=textBox1.Text;
strname=textBox2.Text;
num=Convert.ToInt32(strnum);
strins="Insert into db("+"NUM"+",NAME"+")VALUES('"+num+"','"+strname+" ')";
cmd.CommandText=strins;
cmd.Connection=con;
cmd.ExecuteNonQuery();
ds.Clear();
da.Fill(ds,"db");
con.Close();
}