请问怎么把下面VB的for语句改成C#的，谢谢~~~~~~~~~~
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim intClassID As Integer = Convert.ToInt32(ddlstclass.SelectedItem.Value)
        Dim intCourseID As Integer = Convert.ToInt32(ddlstcourse.SelectedItem.Value)
        Dim intTeacherID As Integer = Convert.ToInt32(ddlstTea.SelectedItem.Value)
        Dim intTerm As String = TextBox1.Text
        Dim conn As New SqlConnection
        conn.ConnectionString = ConfigurationManager.ConnectionStrings("ASPNETDBConnectionString").ConnectionString
        Dim i As Integer
        For i = 0 To gvstu.Rows.Count - 1
            Dim lbl1 As Label
            lbl1 = gvstu.Rows.Item(i).FindControl("Label1")
            Dim intStudentID As Integer = Convert.ToInt32(lbl1.Text)
            intStudentID = Convert.ToInt32(lbl1.Text)
            Dim strsql As String = "insert into Score(studenID,courseID,TeacherID,Term) values(" & intStudentID & "," & intCourseID & "," & intTeacherID & ",'" & intTerm & "')"
            Dim cmd As New SqlCommand(strsql, conn)
            conn.Open()
            cmd.ExecuteNonQuery()
            conn.Close()
        Next
    End Sub