C＃：DataGridView第二次无法正确填充

Question

以下代码在加载表单时效果很好。问题出在这里，当我再次调用方法来填充Datagridview时，datagridview列随机填充从DB返回的数据。

public void displayDataInGrid()
{
    try
    {
        if (connection.State == ConnectionState.Closed)
        {
            connection.Open();
        }
        sda = null;
        sda = new SqlDataAdapter("SELECT * FROM Product", connection);
        ds = new DataSet();

        sda.Fill(ds, "Product");
        dataGridView1.Columns[2].DataPropertyName = "Pro_Name";
        dataGridView1.Columns[3].DataPropertyName = "Pro_Type";
        dataGridView1.Columns[4].DataPropertyName = "Quantity";
        dataGridView1.Columns[5].DataPropertyName = "Cost_Price";
        dataGridView1.Columns[6].DataPropertyName = "Market_Price";
        dataGridView1.Columns[7].DataPropertyName = "Exp_Date";
        dataGridView1.Columns[8].DataPropertyName = "Bar_Code";
        dataGridView1.Columns[9].DataPropertyName = "Pro_Id";
        dataGridView1.DataSource = ds.Tables[0];

        connection.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show("Error\n" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

Answer 1

试着说出来：

' ** CODE **
dataGridView1.Rows.Clear();
dataGridView1.Refresh();
dataGridView1.DataSource = ds.Tables[0];

connection.Close();
' ** CODE **

如果它没有运行，请在SQL查询中指定您需要在DataGridView中显示的列。