I am trying to select film by using on select command, print the title in a label once selected.. that works well.
next part is the selected film will then decrement 1 from the database stock on button click. This is where I think I am getting confused, its showing no errors until the button click takes place.
C# code for update query
protected void Button2_Click(object sender, EventArgs e)
{
var myquery = string.Format("UPDATE DVD SET Stock = Stock - 1");
da.InsertCommand = new OleDbCommand("INSERT INTO DVD (Stock) VALUES (@MessageLabel)", conn);
{
da.InsertCommand.Parameters.AddWithValue("@Stock", MessageLabel.Text);
conn.Open();
da.InsertCommand.ExecuteNonQuery();
using (OleDbCommand cmd = new OleDbCommand(myquery, conn))
cmd.ExecuteNonQuery();
conn.Close();
conn.Dispose();
}
}
Previous code for select event
public void Latest_DVD()
{
{
using (OleDbDataAdapter dataquer = new OleDbDataAdapter("SELECT Title,Category,Director,Stock,Year FROM DVD ", conn))
{
dataquer.Fill(dt);
}
}
DG_Latest.ShowHeader = true;
DG_Latest.DataSource = dt;
DG_Latest.DataBind();
conn.Close();
conn.Dispose();
}
protected void Latest_DVD_SelectedIndexChanged(Object sender, EventArgs e)
{
GridViewRow row = DG_Latest.SelectedRow;
MessageLabel.Text = "You selected to rent " + row.Cells[1].Text + ".";
}
so I am thinking I have the query wrong and possibly nor retrieve the update from the label but maybe the on select its self... I am not sure through.
the error it is showing is
Data type mismatch in criteria expression.
just after the connection is open