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public Form1()
public SqlConnection baglanti; // sql bağlantısı için değişken tanımlandı .
public SqlCommand komut; // sql komutlarını girmek için değişken tanımlandı.
public SqlDataAdapter adaptor; // sqlden uygulamaya bağlantı sağlamak için değişken tanımlandı.
public DataTable dt; // sqldeki tabloyu uygulamaya aktarmak için değişken tanımlandı.

void yenile()
baglanti = new SqlConnection("Data Source=.;Initial Catalog=OKUL;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False");
adaptor = new SqlDataAdapter("select * from ogrenci ", baglanti);
dt = new DataTable();
dataGridView1.DataSource = dt;

private void Form1_Load(object sender, EventArgs e)


private void button1_Click(object sender, EventArgs e)
komut = new SqlCommand();
komut.Connection = baglanti;
// komut.CommandText="delete from ogrenci where OGR_NO="+textBox1.Text+""; sütunu silme
komut.CommandText = "update ogrenci set OGR_NO="+textBox1.Text+",ad='"+textBox2.Text+"',soyad='"+textBox3.Text+",'" where OGR_NO="+textBox1.Text+" ";

komut.CommandText="insert into ogrenci values("+ textBox1.Text+",'" + textBox2.Text +"','"+textBox3.Text+"');
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