如何在按下按钮后刷新datagridview

Question

您好我正在为一所拥有本地SQL数据库的学校制作一个小型winforms应用程序。我正在使用DataGridView来显示数据，但在我添加新学生后，DataGridView不会刷新。

        con.Open();
        MessageBox.Show("Connection Open");
        SqlCommand cm = new SqlCommand("INSERT INTO Students(Grade,Class,Name,sName) VALUES (@Grade,@Class,@Name,@sName)", con);
        cm.Parameters.AddWithValue("@Grade", cbGrade.Text);
        cm.Parameters.AddWithValue("@Class", comboClass.Text);
        cm.Parameters.AddWithValue("@Name", tbFName.Text);
        cm.Parameters.AddWithValue("@sName", tbSName.Text);

try
        {
            int exec = cm.ExecuteNonQuery();
            if(exec>0)
            {
                MessageBox.Show("Added");

            }
            else
            {
                MessageBox.Show("Not added");
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Something went wrong");
            con.Close();
        }
        finally
        {
            con.Close();
        }

Answer 1

一切正常。

            string query = "select * from students";
            SqlCommand cmd = new SqlCommand(query,con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            DGVStudents.DataSource = dt;