problem on date,month year concatenation

• • Reply

  14 years ago

  by Vinay08

  Vinay Sobha

  Port-Louis, Mauritius

  Joined 14 years ago

  hi experts,

  actually i run this piece of code and obtained this error.I have 3 drop down control , one for date , one for month and the last is for year and a button to check which will display the result in the label. But i'm getting the following error. Please help as the deadline for my project is becoming near. Please help....

  IPrivate Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

  Dim strdob As Date

  Dim strday As String

  Dim strmon As String

  Dim stryear As String

  strday = dayddl.SelectedValue

  strmon = mmddl.SelectedValue

  stryear = yearddl.SelectedValue

  strdob = strday & strmon & stryear

  Label1.Text=Convert.ToDateTime(strdob)

   

  End Sub

  Error obtained:

   

  Cast from string "01011980" to type 'Date' is not valid.

  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
  
  Exception Details:
  
  System.InvalidCastException: Cast from string "01011980" to type 'Date' is not valid.
  
  Source Error:
  
  

  Line 40:         stryear = yearddl.SelectedValue Line 41: Line 42:         strdob = strday & strmon & stryear Line 43:         Convert.ToDateTime(strdob) Line 44:         Label1.Text = strdob

  
  Source File:
  c:\inetpub\wwwroot\WebApplication1\WebForm1.aspx.vb    Line: 42
  
  Stack Trace:
  
  

  [InvalidCastException: Cast from string "01011980" to type 'Date' is not valid.]    Microsoft.VisualBasic.CompilerServices.DateType.FromString(String Value, CultureInfo culture) +163    Microsoft.VisualBasic.CompilerServices.DateType.FromString(String Value) +53    WebApplication1.WebForm1.Button1_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\WebApplication1\WebForm1.aspx.vb:42    System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108    System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33    System.Web.UI.Page.ProcessRequestMain() +1277

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• • Reply

  14 years ago

  by inferano

  Paul N

  Bangalore,India, India

  Joined 15 years ago

  Basically what you are trying to do is assign the Text property of the label to a DateTime value which is not supported. You should assign a string value to the Text property isn't it?

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• • Reply

  14 years ago

  by Chital

  Chital Panchal

  Pune, India

  Joined 14 years ago

  Hello Vinay,

  You are assigning String value to DateTime variable.

  strdob is DateTime Variable and the concatinated value is string. So, this error is obvious.

  Now, First of all, Concatinate Day,Month and Year into one string variable.

  for eg.

  Dim strDate as string

  strDate= strDay & "/" & strMonth "/" & strYear

  then after

  strdob=Convert.DateTime(strDate)

  Label1.text=strdob

  This will solve your problem.

   

  Regards,

  Chital

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• • Reply

  14 years ago

  by Vinay08

  Vinay Sobha

  Port-Louis, Mauritius

  Joined 14 years ago

  Hi Friend,

  Could you just correct the code how it should be as i'm a bit novice in asp.net and I've try to work with it several times but in vain.Please correct the code or me and post it in the forum please.

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• • Reply

  14 years ago

  by Vinay08

  Vinay Sobha

  Port-Louis, Mauritius

  Joined 14 years ago
  Thanks a lots friend your code works. It will help me a lot in my project. Thanks again.
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• • Reply

  14 years ago

  by Chital

  Chital Panchal

  Pune, India

  Joined 14 years ago

  Anytime...

   

  Regards,

   

  Chital

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• • Reply

  14 years ago

  by Vinay08

  Vinay Sobha

  Port-Louis, Mauritius

  Joined 14 years ago

  Hi Chital,

  Sorry to bother you once again, Do you have the validation for these text box such as date month & year so that it will recognise 31 days or 30 days for a month and for february it should be 28 days or 29 ( in case of leap year or common year. If you do have it please make me have it.

  Thanks .

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