How to store the row entire gridview controls to database

this is my code what i can do to save the rows entire gridview to databse
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<div>
            <asp:GridView ID="grvStudentDetails" runat="server" ShowFooter="True" AutoGenerateColumns="False"
                CellPadding="4" ForeColor="#333333" GridLines="None" OnRowDeleting="grvStudentDetails_RowDeleting"
                Width="97%" Style="text-align: left" OnRowDataBound="gv_RowDataBound">
                <Columns>
                    <asp:BoundField DataField="RowNumber" HeaderText="SNo" />
                    <asp:TemplateField HeaderText="Student Name">
                        <ItemTemplate>
                            <asp:TextBox ID="txtName" runat="server" MaxLength="50"></asp:TextBox>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtName"
                                ErrorMessage="*" SetFocusOnError="True"></asp:RequiredFieldValidator>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Student Age">
                        <ItemTemplate>
                            <asp:TextBox ID="txtAge" runat="server" MaxLength="3" Width="66px"></asp:TextBox>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtAge"
                                ErrorMessage="*" SetFocusOnError="True"></asp:RequiredFieldValidator>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Student Address">
                        <ItemTemplate>
                            <asp:TextBox ID="txtAddress" runat="server" Height="55px" TextMode="MultiLine"></asp:TextBox>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="txtAddress"
                                ErrorMessage="*" SetFocusOnError="True"></asp:RequiredFieldValidator>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Gender">
                        <ItemTemplate>
                            <asp:RadioButtonList ID="RBLGender" runat="server" RepeatDirection="Horizontal">
                                <asp:ListItem Value="M">Male</asp:ListItem>
                                <asp:ListItem Value="F">Female</asp:ListItem>
                            </asp:RadioButtonList>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="RBLGender"
                                ErrorMessage="*"></asp:RequiredFieldValidator>&nbsp;
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Qualification">
                        <ItemTemplate>
                            <asp:DropDownList ID="drpQualification" runat="server">
                                <asp:ListItem>Select</asp:ListItem>
                                <asp:ListItem Value="G">Graduate</asp:ListItem>
                                <asp:ListItem Value="P">Post Graduate</asp:ListItem>
                            </asp:DropDownList>
                            <asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server" ControlToValidate="drpQualification"
                                ErrorMessage="*" InitialValue="Select"></asp:RequiredFieldValidator>
                        </ItemTemplate>
                        <FooterStyle HorizontalAlign="Right" />
                        <FooterTemplate>
                            <asp:Button ID="ButtonAdd" runat="server" Text="Add New Row" OnClick="ButtonAdd_Click" />
                        </FooterTemplate>
                    </asp:TemplateField>
                    <asp:CommandField ShowDeleteButton="True" />
                </Columns>
                <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <RowStyle BackColor="#EFF3FB" />
                <EditRowStyle BackColor="#2461BF" />
                <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <AlternatingRowStyle BackColor="White" />
            </asp:GridView>
            <br />
            <center>
                <asp:Button ID="btnSave" runat="server" Text="Save Data" OnClick="btnSave_Click" />
            </center>
        </div>

and my code behind is :

<blockquote class="quote"><div class="op">Quote:</div> protected void btnSave_Click(object sender, EventArgs e)
    {


        con.Open();
        tran = con.BeginTransaction();
        cmd.Transaction = tran;
        string slno = null;

            foreach (GridViewRow g1 in grvStudentDetails.Rows)
                {

                    //string id = ((TextBox)g1.Cells[0].FindControl("txName")).Text;
                    string id = ((TextBox)g1.FindControl("TextBox1")).Text;
                    string name = (g1.FindControl("txAge") as TextBox).Text;
                    string price = (g1.FindControl("txtAddress") as TextBox).Text;
                    string description = (g1.FindControl("RBLGender") as Label).Text;

                    string query = "insert into SU_Seeker_Qualifications (Type,Join_Date,Graduated_Date,Univerisity) values(" + id + ",'" + name + "'," + price + ",'" + description + "')";
                 slno = id;
                    cmd.CommandText = query;
                    cmd.ExecuteNonQuery();
                }
                tran.Commit();
                lblMessage.Text = "Records inserted successfully";
        //}
        con.Close();</blockquote>