How to insert that value of DropDownList to the Database?

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C#

ASP.NET

I have two tables in my database as following:

Suggestions Table: ID, Title, Description, StatusID... etc

SuggestionsStatus Table: ID, Status

I am using GridView to show the Suggestions and in the last column I put a DropDownList that for selecting the status for each Suggestion. Now, when I tried to update the Status of one of the submitted suggestions by selecting the status from the DropDownList, the value has been selected but it wasn't inserted to the Database (which means still I have NULL value in the StatusID column in the Suggestions Table) and I don't know why.

My ASP.NET code:

<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
                        AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ID"
                        width="950px" CssClass="mGrid"
                        AlternatingRowStyle-CssClass="alt"
                        RowStyle-HorizontalAlign="Center"
                        DataSourceID="SqlDataSource1"
                        OnRowDataBound="GridView1_RowDataBound" >
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            <HeaderStyle Font-Bold = "true" ForeColor="Black" Height="20px"/>
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
                    ReadOnly="True" SortExpression="ID" />
                <asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
                <asp:BoundField DataField="Description" HeaderText="Description"
                    SortExpression="Description" />
                <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
                <asp:BoundField DataField="Username" HeaderText="Username"
                    SortExpression="Username" />
                <asp:BoundField DataField="DivisionShortcut" HeaderText="Division"
                    SortExpression="DivisionShortcut" />
                <asp:TemplateField HeaderText="Status">
                    <ItemTemplate>
                        <asp:DropDownList ID="DropDownList" runat="server" DataSourceID="SqlDataSource2"
                                          Font-Bold="True" ForeColor="#006666" AppendDataBoundItems="false"
                                          DataTextField="Status" DataValueField="ID" AutoPostBack="true"
                                          OnDataBound="DropDownList_DataBound">
                        </asp:DropDownList>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
            ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
            SelectCommand="SELECT     dbo.SafetySuggestionsLog.ID, dbo.SafetySuggestionsLog.Title, dbo.SafetySuggestionsLog.Description, dbo.employee.Name, dbo.SafetySuggestionsLog.Username,
                      dbo.Divisions.DivisionShortcut
FROM         dbo.employee INNER JOIN
                      dbo.SafetySuggestionsLog ON dbo.employee.Username = dbo.SafetySuggestionsLog.Username INNER JOIN
                      dbo.Divisions ON dbo.employee.DivisionCode = dbo.Divisions.SapCode"
                      FilterExpression="[DivisionShortcut] like '{0}%'">

                      <FilterParameters>
                        <asp:ControlParameter ControlID="ddlDivision" Name="DivisionShortcut"
                                                 PropertyName="SelectedValue" Type="String" />
                    </FilterParameters>
        </asp:SqlDataSource>

        <%--For the DropDownList--%>
        <asp:SqlDataSource ID="SqlDataSource2" runat="server"
        ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
        SelectCommand="SELECT * FROM [SafetySuggestionsStatus]"></asp:SqlDataSource>

My Code-Behind:

protected void DropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
    DropDownList ddl = (DropDownList)sender;
    int suggestionStatus = int.Parse(ddl.SelectedValue);

    //For inserting the status in the database
    string connString = "Data Source=localhost\\sqlexpress;Initial Catalog=psspdbTest;Integrated Security=True";
    string updateCommand = "UPDATE SafetySuggestionsLog  SET [StatusID] = @StatusID WHERE [ID] = '" + index + "'";
    using (SqlConnection conn = new SqlConnection(connString))
    {
        conn.Open();
        using (SqlCommand cmd = new SqlCommand(updateCommand, conn))
        {
            cmd.Parameters.Clear();
            cmd.Parameters.AddWithValue("@StatusID", suggestionStatus);
            cmd.ExecuteNonQuery();
        }
        conn.Close();
    }
}
}

** EDIT:**

I modified the DropDownList_SelectedIndexChanged() as shown above but it gave me the following error:

Cannot insert the value NULL into column 'Title', table 'psspdbTest.dbo.SafetySuggestionsLog'; column does not allow nulls. INSERT fails.
The statement has been terminated.

So how I can fix this problem to be able to update the status of one of the submitted Suggestions in the (GridView) in the database?**