How to validate time using compare validator? - asp.net

Question

How to validate time using compare validator?
I have a Editable gridview that contain 2 column for time Start & End Time and I want to validate them that star time must be earlier than end time. I have 24 hour format.
For Example If I entered Start Time: 20:30 and the End Time is 19:30 it should give me error and prevent me from Updating the row

Answer 1

simply you can try this
In aspx code
<div>
<asp:GridView ID="gvDetails" DataKeyNames="EventID,EventName" runat="server" AutoGenerateColumns="false"
CssClass="Gridview" HeaderStyle-BackColor="#61A6F8" ShowFooter="true" HeaderStyle-Font-Bold="true"
HeaderStyle-ForeColor="White" OnRowCancelingEdit="gvDetails_RowCancelingEdit"
OnRowDeleting="gvDetails_RowDeleting" OnRowEditing="gvDetails_RowEditing" OnRowUpdating="gvDetails_RowUpdating"
OnRowCommand="gvDetails_RowCommand">
<Columns>
<asp:TemplateField>
<EditItemTemplate>
<asp:ImageButton ID="imgbtnUpdate" CommandName="Update" runat="server" ImageUrl="~/Images/update.jpg"
ToolTip="Update" Height="20px" Width="20px" />
<asp:ImageButton ID="imgbtnCancel" runat="server" CommandName="Cancel" ImageUrl="~/Images/Cancel.jpg"
ToolTip="Cancel" Height="20px" Width="20px" />
</EditItemTemplate>
<ItemTemplate>
<asp:ImageButton ID="imgbtnEdit" CommandName="Edit" runat="server" ImageUrl="~/Images/Edit.jpg"
ToolTip="Edit" Height="20px" Width="20px" />
<asp:ImageButton ID="imgbtnDelete" CommandName="Delete" Text="Edit" runat="server"
ImageUrl="~/Images/delete.jpg" ToolTip="Delete" Height="20px" Width="20px" />
</ItemTemplate>
<FooterTemplate>
<asp:ImageButton ID="imgbtnAdd" runat="server" ImageUrl="~/Images/AddNewitem.jpg"
CommandName="AddNew" Width="30px" Height="30px" ToolTip="Add new User" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="EventName">
<EditItemTemplate>
<asp:Label ID="lbleditusr" runat="server" Text='<%#Eval("EventName") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblitemUsr" runat="server" Text='<%#Eval("EventName") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrusrname" runat="server" />
<asp:RequiredFieldValidator ID="rfvEventName" runat="server" ControlToValidate="txtftrusrname"
Text="*" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="StartTime">
<EditItemTemplate>
<asp:TextBox ID="txtStartTime" runat="server" Text='<%#Eval("StartTime") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblStartTime" runat="server" Text='<%#Eval("StartTime") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrStartTime" runat="server" />
<asp:RequiredFieldValidator ID="rfvStartTime" runat="server" ControlToValidate="txtftrStartTime"
Text="*" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="EndTime">
<EditItemTemplate>
<asp:TextBox ID="txtstate" runat="server" Text='<%#Eval("EndTime") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblstate" runat="server" Text='<%#Eval("EndTime") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrEndTime" runat="server" />
<asp:RequiredFieldValidator ID="rfvEndTime" runat="server" ControlToValidate="txtftrEndTime"
Text="*" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
And at code behind
protected void gvDetails_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("AddNew"))
{
TextBox txtUsrname = (TextBox)gvDetails.FooterRow.FindControl("txtftrusrname");
TextBox txtStartTime = (TextBox)gvDetails.FooterRow.FindControl("txtftrStartTime");
TextBox txtEndTime = (TextBox)gvDetails.FooterRow.FindControl("txtftrEndTime");
if (Convert.ToDateTime(txtEndTime.Text.Trim().ToString()) <= Convert.ToDateTime(txtStartTime.Text.Trim().ToString()))
{
lblresult.Text = "Please enter valid end time";
}
else
{
con.Open();
SqlCommand cmd =
new SqlCommand(
"insert into tblEvents(EventName,StartTime,EndTime) values('" + txtUsrname.Text + "','" +
txtStartTime.Text + "','" + txtEndTime.Text + "')", con);
int result = cmd.ExecuteNonQuery();
con.Close();
if (result == 1)
{
BindEmployeeDetails();
lblresult.ForeColor = Color.Green;
lblresult.Text = txtUsrname.Text + " Details inserted successfully";
}
else
{
lblresult.ForeColor = Color.Red;
lblresult.Text = txtUsrname.Text + " Details not inserted";
}
}
}
}