bind datatable value to gridview in asp.net

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ASP.NET4

Hi friends,

This is the following code for binding gridview from datatable.

<pre lang="c#">DataTable result = inter.griddatabind(s, adminid);
            if (result!=null)
            {
                for (int i = 0; i < result.Rows.Count; i++)
                {
                    subjectteachgrid.Rows[i].Cells[1].Text = result.Rows[i]["AcademicYear"].ToString();
                    subjectteachgrid.Rows[i].Cells[2].Text = result.Rows[i]["Medium"].ToString();
                    subjectteachgrid.Rows[i].Cells[3].Text = result.Rows[i]["ClassName"].ToString() + "-" + result.Rows[i]["SectionName"].ToString();
                    subjectteachgrid.Rows[i].Cells[4].Text = result.Rows[i]["SubjectName"].ToString();
                    subjectteachgrid.Rows[i].Cells[5].Text = result.Rows[i]["Teachername"].ToString();
                    subjectteachgrid.Rows[i].Cells[6].Text = result.Rows[i]["Teacher_Type"].ToString();
                    subjectteachgrid.Rows[i].Cells[7].Text = result.Rows[i]["Maxnoofperiod"].ToString();

                }

and the following is my aspx file

<pre lang="HTML"><Columns>
                            <asp:CommandField ButtonType="Image" CancelImageUrl="~/images/Cancel.jpg" 
                                DeleteImageUrl="~/images/delete.jpg" EditImageUrl="~/images/Edit.jpg" 
                                ShowDeleteButton="True" ShowEditButton="True" 
                                UpdateImageUrl="~/images/update.jpg" />
             <asp:TemplateField HeaderText="AcadmicYear" >
             <ItemTemplate>
             <asp:Label ID="acyearlbl" runat="server" Text='<%# Eval("AcadamicYear") %>'/>
             </ItemTemplate>
             <EditItemTemplate>
             <asp:DropDownList ID="acyeardropdown1" AutoPostBack="true" OnSelectedIndexChanged="acyeardropdown1_SelectedIndexChanged" runat="server" Width="100px">
            </asp:DropDownList>
            
             </EditItemTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Medium">
             <ItemTemplate>
             <asp:Label ID="mediumlbl" runat="server" Text='<%# Eval("Medium") %>'/>
             </ItemTemplate>
             <EditItemTemplate>
             <asp:DropDownList ID="mediumdropdown1" AutoPostBack="true"  OnSelectedIndexChanged="mediumdropdown1_SelectedIndexChanged" runat="server" Width="100px">
            </asp:DropDownList>
            
             </EditItemTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Class">
             <ItemTemplate>
             <asp:Label ID="classlbl" runat="server" Text='<%# Eval("ClassName") %>'/>
             </ItemTemplate>
             <EditItemTemplate>
             <asp:DropDownList ID="Classdropdown1"  runat="server" AutoPostBack="true" OnSelectedIndexChanged="Classdropdown1_SelectedIndexChanged" Width="100px">
            </asp:DropDownList>
            
             </EditItemTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Subject">
             <ItemTemplate>
             <asp:Label ID="Label2" runat="server" Text='<%# Eval("Subject") %>'/>
             </ItemTemplate>
             <EditItemTemplate>
             <asp:DropDownList ID="Subjectdropdown1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="Subjectdropdown1_SelectedIndexChanged" Width="100px">
            </asp:DropDownList>
            
             </EditItemTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Teacher">
             <ItemTemplate>
             <asp:Label ID="Label2" runat="server" Text='<%# Eval("Teacher") %>'/>
             </ItemTemplate>
             <EditItemTemplate>
             <asp:DropDownList ID="Teacherdropdown1" AutoPostBack="true" runat="server"  Width="100px">
            </asp:DropDownList>
            
             </EditItemTemplate>
             </asp:TemplateField>
             <asp:TemplateField HeaderText="Designation">
             <ItemTemplate>
             <asp:Label ID="Label2" runat="server" Text='<%# Eval("Designation") %>'/>
             </ItemTemplate>
             <EditItemTemplate>
             <asp:DropDownList ID="Designationdropdown1" AutoPostBack="false" runat="server"  Width="100px">
            </asp:DropDownList>
            
             </EditItemTemplate>
             </asp:TemplateField>
             <asp:BoundField HeaderText="Max Period" runat="server" DataField="MaximumPeriod" />
                        </Columns>

The datatable value is not null and it has the value.but the following error is occured.
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index