private void btn_update_Click(object sender, EventArgs e)
{
string RegNumber = textBox2.Text;
DBconnect db = new DBconnect();
db.Update($"UPDATE students SET RegistrationNumber={RegNumber} WHERE Name='john'");
}
private void UpdatebunifuFlatButton_Click(object sender, EventArgs e)
{
DBconnect dBconnect = new DBconnect();
dBconnect.Update($"UPDATE customers SET Mobile={bunifuMaterialTextbox2.Text},Address={bunifuMaterialTextbox3.Text},Picture={pictureBox1.Image} WHERE CustomerName='{bunifuMaterialTextbox1.Text}'");
}