为什么我的datetimepicker不会在datagridview中显示？

Question

我尝试了很多代码，但为什么它不会在数据网格视图中显示？ 以下是我的代码：

Dim cmd As New MySqlCommand 

  If TextBox1.Text = "" Or TextBox2.Text = "" Or TextBox3.Text = "" Or TextBox4.Text = "" Or TextBox5.Text = "" Then
            MsgBox("provide all details!")
        Else
            Try
                myconn.Open()
                cmd.Connection = myconn
                cmd.CommandText = "insert into borrow (ID,StudentName,Code,Book,Author,DateBorrowed,DueDate) values ('" & TextBox1.Text & "','" & TextBox2.Text & "','" & TextBox3.Text & "','" & TextBox4.Text & "','" & TextBox5.Text & "' ,'" & DateTimePicker1.Value & "' ,'" & DateTimePicker2.value & "')"
                cmd.ExecuteNonQuery()
                MsgBox("BOOK BORROWED!")
                TextBox1.Text = ""
                TextBox2.Text = ""
                TextBox3.Text = ""
                TextBox4.Text = ""
                TextBox5.Text = ""
                DateTimePicker1.Value
                DateTimePicker2.Value