Dropdownlist in Gridview not storing or getting selected value

In aspx:
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<asp:GridView id="gvTasks" OnRowCommand="gvTasks_RowCommand" OnRowUpdating="gvTasks_RowUpdating" OnRowDataBound="gvTasks_RowDataBound" DataKeyNames="pkiTask" OnRowEditing="gvTasks_RowEditing" AutoGenerateColumns="False" CellPadding="2">
  <Columns>
    <asp:ButtonField DataTextField="uqsTaskName" HeaderText="Task Name" Text="Button" SortExpression="uqsTaskName" CommandName="ViewMessage" />
    <asp:TemplateField HeaderText="Assign To" >
      <EditItemTemplate >
       <asp:DropDownList ID="ddlLogins" runat="server" Width="190px" TabIndex="-1" DataValueField="pksLogin" 
                            DataTextField="pksLogin">
       </asp:DropDownList>
      </EditItemTemplate>
      <ItemTemplate>
         <asp:Label ID="Label1" runat="server" Text='<%# Bind("sAssignedTo") %>'></asp:Label>
      </ItemTemplate>
   </asp:TemplateField>
 </Columns>
</asp:GridView>
 
In Code behind aspx.cs
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protected void gvTasks_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        DBServices DBS = new DBServices();
        int roleID = (int)Session["RoleID"];
        DataSet dsInit = new DataSet();
        dsInit = DBS.GetUserSecuritysLogin(roleID);
        DropDownList ddl = (DropDownList)e.Row.FindControl("ddlLogins");
        if (ddl != null)
        {
            if (dsInit.Tables[0].Rows.Count > 0)
            {
                foreach (DataRow dr in dsInit.Tables[0].Rows)
                {
                    ddl.Items.Add(dr["pksLogin"].ToString());
                }
            }
            //string loginName = e.Row.Cells[3].Text;
            ddl.SelectedValue = e.Row.Cells[3].Text;   
        }
    }
 
protected void gvTasks_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
               
        int index = e.RowIndex;
        GridViewRow row = gvTasks.Rows[index];
        
        int TaskID = (int)gvTasks.DataKeys[row.DataItemIndex].Value;
 
        DropDownList ddl1 = new DropDownList();
        ddl1 = (DropDownList)gvTasks.Rows[index].FindControl("ddlLogins");
        string loginName = ddl1.SelectedValue;
 
        DBServices DBS = new DBServices();
        DBS.SetTasksAssignedTo(TaskID, loginName);
 
        gvTasks.EditIndex = -1;
        BindData();
 
    }