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OleDbConnection conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=veritabani.accdb;Persist Security Info=False;");

DataTable tablo = new DataTable();
OleDbCommand cmnd = new OleDbCommand();
OleDbDataReader dr;
panel pnl = new panel();
public List<string> bolum_kodlari = new List<string>();
public List<string> bolumler = new List<string>();
List<string> ogr_Ad = new List<string>();
List<string> ogr_Unvan= new List<string>();

private void button1_Click(object sender, EventArgs e)
{
OleDbConnection xlsxbaglanti = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + yol + "'; Extended Properties='Excel 12.0 Xml;HDR=YES'");

xlsxbaglanti.Open(); //Bağlantımızı açtık
tablo.Clear(); //Önceki verilerle karışmaması için tabloyu her tıklamada sıfırlıyoruz
OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM [GENEL$]", xlsxbaglanti); //OleDbDataAdapter ile excel dosyamızdaki verileri listeliyoruz. Burada önemli olan kısım sorgu cümleciğinde ki Sheet1$ kısmı yerine excel dosyasındaki sayfa ismini yazmanız gerek. Bu isim excel dosyanızı açtığınızda en altta yazan isimdir. Eğer değiştirmediyseniz zaten Sayfa1 olarak yazar. Ayrıca " $ " simgesi ve köşeli parentezleri ellememeniz gerek.
da.Fill(tablo); //Gelen sonuçları datatable'a gönderiyoruz.
dataGridView1.DataSource = tablo; //datatable'da ki verileri datagrid'de listeliyoruz.

xlsxbaglanti.Close(); //Bağlantıyı kapatıyoruz.
MessageBox.Show(dataGridView1.Columns[6].ToString());
}

private void veri_aktar_Load(object sender, EventArgs e)
{
cmnd.Connection = conn;
}
string deger,kod;
int sayac=0,bul=0;
string ad_soyad, unvan;
string komut;
private void button2_Click(object sender, EventArgs e)
{
conn.Open();
cmnd.CommandText = "delete * from gorevli";
cmnd.ExecuteNonQuery();

for (int i = 1; i < dataGridView1.RowCount; i++)
{

try
{
ad_soyad = dataGridView1.Rows[i].Cells[2].Value.ToString();
unvan = dataGridView1.Rows[i].Cells[1].Value.ToString();
ad_soyad.Trim();
unvan.Trim();
cmnd.CommandText = komut;
cmnd.ExecuteNonQuery();
}
catch (Exception)
{


}



}
MessageBox.Show("İşlem tamamlandı veritabanını kontrol ediniz");
conn.Close();
}

private void button3_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = ".xlsx |*.xlsx| .xls|*.xls";
openFileDialog1.FilterIndex = 1;
openFileDialog1.RestoreDirectory = true;

openFileDialog1.Title = "Excel Dosyası Seçiniz..";
openFileDialog1.ShowDialog();

yol = openFileDialog1.FileName;

}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.SelectedItem=="Sınıflar")
{
komut = "insert into gorevli (ad_soyad,unvan) values ('" + ad_soyad + "','" + unvan + "')";
}

}


     
 
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