Question

I have a problem with my code regarding editing data in database using a DataGridView.

I have an error at da.update(dt); It says,

Dynamic SQL generation for the UpdateCommand is not supported against
a SelectCommand that does not return any key column information.

When i change the SELECT to UPDATE/INSERT I get an error at da.fill(dt);.

What is wrong with my code?

Here’s my code:

private void btnEdit_Click(object sender, EventArgs e) > {
    con.Open();
    DataTable dt = new DataTable();
    SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM RegistrationTable", con);
    da.Fill(dt);
    dt.Rows[dgvREGtable.CurrentRow.Index].BeginEdit();
    dt.Rows[dgvREGtable.CurrentRow.Index][0] = tbFirstname.Text;
    dt.Rows[dgvREGtable.CurrentRow.Index][1] = tbLastname.Text;
    dt.Rows[dgvREGtable.CurrentRow.Index][2] = tbEmail.Text;
    dt.Rows[dgvREGtable.CurrentRow.Index][3] = tbContacts.Text;
    dt.Rows[dgvREGtable.CurrentRow.Index][4] = tbUsername.Text;
    dt.Rows[dgvREGtable.CurrentRow.Index][5] = tbPassword.Text;
    dt.Rows[dgvREGtable.CurrentRow.Index].EndEdit();
    SqlCommandBuilder cb = new SqlCommandBuilder(da);
    da.Update(dt);
    displayrecords();
    con.Close();
}

Answer 1

Your select query needs to return the primary key of the table. If your table doesn’t have a primary key, you need to set one.