Trying to convert string to datetime
- by user1596472
I am trying to restrict a user from entering a new record if the date requested already exits. I was trying to do a count to see if the table that the record would be placed in already has that date 1 or not 0. I have a calendar extender attached to a text box which has the date.
I keep getting either a:
String was not recognized as a valid DateTime.
or
Unable to cast object of type 'System.Web.UI.WebControls.TextBox' to type 'System.IConvertible'.
depending on the different things I have tried.
Here is my code.
TextBox startd = (TextBox)(DetailsView1.FindControl("TextBox5"));
TextBox endd = (TextBox)(DetailsView1.FindControl("TextBox7"));
DropDownList lvtype = (DropDownList)(DetailsView1.FindControl("DropDownList6"));
DateTime scheduledDate = DateTime.ParseExact(startd.Text, "dd/MM/yyyy", null);
DateTime endDate = DateTime.ParseExact(endd.Text, "dd/MM/yyyy", null);
DateTime newstartDate = Convert.ToDateTime(startd.Text);
DateTime newendDate = Convert.ToDateTime(endd.Text);
//foreach (DataRow row in sd.Tables[0].Rows)
DateTime dt = newstartDate;
while (dt <= newendDate)
{
//for retreiving from table
Decimal sd = SelectCountDate(dt, lvtype.SelectedValue, countDate);
String ndt = Convert.ToDateTime(dt).ToShortDateString();
// //start = string.CompareOrdinal(scheduledDate, ndt);
// // end = string.CompareOrdinal(endDate, ndt);
//trying to make say when leavetpe is greater than count 1 then throw error.
if (sd > 0)
{
Response.Write("<script>alert('Date Already Requested');</script>");
}
dt.AddDays(1);
}
^^^
This version throws the: "String was not recognized as valid date type" error
But if i replace the string with either of these :
/*-----------------------Original------------------------------------
string scheduledDate = Convert.ToDateTime(endd).ToShortDateString();
string endDate = Convert.ToDateTime(endd).ToShortDateString();
-------------------------------------------------------------------*/
/*----------10-30---------------------------------------
DateTime scheduledDate = DateTime.Parse(startd.Text);
DateTime endDate = DateTime.Parse(endd.Text);
------------------------------------------------------*/
I get the "Unable to cast object of type 'System.Web.UI.WebControls.TextBox' to type 'System.IConvertible'." error.
I am just trying to stop a user from entering a record date that already exits.
<InsertItemTemplate>
<asp:TextBox ID="TextBox5" runat="server" Height="19px"
Text='<%# Bind("lstdate", "{0:MM/dd/yyyy}") %>' Width="67px"></asp:TextBox>
<asp:CalendarExtender ID="TextBox5_CalendarExtender" runat="server" Enabled="True"
TargetControlID="TextBox5">
</asp:CalendarExtender>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="TextBox5" ErrorMessage="*Leave Date Required"
ForeColor="Red"></asp:RequiredFieldValidator>
<br />
<asp:CompareValidator ID="CompareValidator18" runat="server"
ControlToCompare="TextBox7" ControlToValidate="TextBox5"
ErrorMessage="Leave date cannot be after start date" ForeColor="Red"
Operator="LessThanEqual" ToolTip="Must choose start date before end date"></asp:CompareValidator>
</InsertItemTemplate>
