DataGrid不显示波斯日历

Question

我想在两次之间搜索。我正在使用此代码：

SqlDataAdapter adap;
DataSet ds = new DataSet();
SqlConnection con = new SqlConnection("Data Source=(local);Initial Catalog=test;Integrated Security=True;MultipleActiveResultSets=True");
con.Open();
SqlCommand cmd = new SqlCommand("SELECT t5 FROM student WHERE t5 BETWEEN '" + label14.Text + "' AND '" + label15.Text + "'", con);
adap = new SqlDataAdapter("SELECT t5 FROM student WHERE t5 BETWEEN  '" + label14.Text + "' AND '" + label15.Text + "'", con);

adap.Fill(ds, "t1");
Datagv1.DataSource = ds.Tables["t1"];

我在数据网格中得到了结果但我的问题是数据网格中的日期时间没有显示在波斯日历中。