Problem in ItemInserting

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C#

ASP.NET

ListView

<pre lang="c#"><pre lang="HTML"><pre lang="HTML">

<InsertItemTemplate>
                                      <tr>
                                          <td>
                                              <asp:TextBox ID="txtName" runat="server" Text='<%# Bind("Name") %>' CssClass="form-input form-control" />
                                          </td>
                                          <td>
                                              <asp:TextBox ID="txtDescription" runat="server" Text='<%# Bind("Descriptn") %>' CssClass="form-input form-control" />
                                          </td>
                                          <td>
                                              <asp:TextBox ID="txtStartDate" runat="server" Text='<%# Bind("StartDate") %>' CssClass="form-input form-control" />
                                               <asp:CalendarExtender ID="txtStartDate_CalendarExtender" runat="server" Enabled="True"
                                                  TargetControlID="txtStartDate" Format="MM/dd/yyyy">
                                              </asp:CalendarExtender>
                                              <td>
                                                  <asp:TextBox ID="txtEndDate" runat="server" Text='<%# Bind("EndDate") %>' CssClass="form-input form-control" />
                                                   <asp:CalendarExtender ID="txtEndDate_CalendarExtender" runat="server" Enabled="True"
                                                      TargetControlID="txtEndDate" Format="MM/dd/yyyy">
                                                  </asp:CalendarExtender>
                                                  <td>
                                                      <asp:TextBox ID="txtYear" runat="server" Text='<%# Bind("ExpYears") %>' CssClass="form-input form-control" />
                                                      <td>
                                                          <asp:Button ID="btnInsert" runat="server" CommandName="Insert" Text="Insert" CssClass="btn btn-default btn-sm" />
                                                          <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" CssClass="btn btn-default btn-sm" />
                                                      </td>
                                      </tr>
                                  </InsertItemTemplate>

protected void lvWork_ItemInserting(object sender, ListViewInsertEventArgs e)
{
string nm = "", desc = "", stdt = "", endt = "", yrs = "";
TextBox txt = (e.Item.FindControl("txtName")) as TextBox;
if (txt != null)
nm = txt.Text;
txt = (e.Item.FindControl("txtDescription")) as TextBox;
if (txt != null)
desc = txt.Text;
txt = (e.Item.FindControl("txtStartDate")) as TextBox;
if (txt != null)
stdt = txt.Text;
txt = (e.Item.FindControl("txtEndDate")) as TextBox;
if (txt != null)
endt = txt.Text;
txt = (e.Item.FindControl("txtYear")) as TextBox;
if (txt != null)
yrs = txt.Text;
objModel = new TeacherWorkExpModel();
tbl_TeacherWorkExp objTable = new tbl_TeacherWorkExp();
objTable.TeacherID = TeacherID;
objTable.Name = nm;
objTable.Descriptn = desc;
objTable.StartDate = Convert.ToDateTime(stdt);
objTable.EndDate = <pre lang="c#"></pre>Convert.ToDateTime(endt);
objTable.ExpYears = Convert.ToInt32(yrs);
objTable.Status = "A";
objTable.CreatedBy = 1;
objTable.CreatedDate = DateTime.UtcNow;
objTable.UpdatedBy = 1;
objTable.UpdatedDate = DateTime.UtcNow;
objModel.SaveData(objTable);

lvWork.EditIndex = -1;
lvWork.DataSource = objModel.FillListView(TeacherID);
lvWork.DataBind();
}