gridview没有显示值

问题描述

我的gridview没有显示数据，

i用断点检查，数据表显示数据但是gridview没有显示， .query是正确的，在Mysql workbench.it的winforms应用程序上毁了。

my gridview is not showing data,
i checked with breakpoints, datatable is showing data but gridview is not showing,.query is correct, runed on Mysql workbench.it's winforms application.

<pre lang="c#"> using (MySqlConnection con = new MySqlConnection(ConnectionString))
            {
                String query = "select * from transaction where DATE(paid_date)BETWEEN '" + fromdate + "'AND'" + todate + "' AND(customer_id='" + customer + "' OR card_id='" + card + "')";
                con.Open();
                MySqlDataAdapter da = new MySqlDataAdapter(query, con);
                DataTable dt = new DataTable();
                da.Fill(dt);
                dataGridView1.DataSource = dt;
                //dataGridView1.DataBind();

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