FormView Conditional Format Error[Answered] RSS

• • Reply
  Billson3000

  Member

  48 Points

  149 Posts

  FormView Conditional Format Error

  Oct 21, 2019 06:12 PM|Billson3000|LINK

  Hello Experts,

  I have a FormView (FormView1) that is populated when the user selects a value in a dropdown list (ddList1). This all works ok. I am trying to apply a background colour to a label in FormView1 when the Value = "Y". This works ok.

  The problem I have is when the user selects a value in ddList1 that has no records in FormView1 then the page errors rather than just appearing with no data.

  Here is my c#

              Label lbl1 = (Label)FormView1.FindControl("MyLabel");
              if (lbl1.Text == "Y")
              {
                  lbl1.BackColor = System.Drawing.Color.Green;
              }
              else lbl1.BackColor = System.Drawing.Color.Red;

  I really appreciate any help someone could give me on this one!

  Billson3000

• • Reply
  oned_gk

  All-Star

  52813 Points

  15768 Posts

  Re: FormView Conditional Format Error

  Oct 22, 2019 12:18 AM|oned_gk|LINK

  Try check FormView1.PageCount > 0 before FindControls inside it

  Programming to simplify, don't look for difficult way
  Suwandi - Non Graduate Programmer
• • Reply
  samwu

  Contributor

  3370 Points

  1409 Posts

  Re: FormView Conditional Format Error

  Oct 22, 2019 01:43 AM|samwu|LINK

  Hi Billson3000,

  Billson3000

  The problem I have is when the user selects a value in ddList1 that has no records in FormView1 then the page errors rather than just appearing with no data.

  According to your description, I can't reproduce your question.

  And since FormView is populated by the user select a value in a dropdownlist, then in what scene FormView will not record?

  My suggestion is to set breakpoints and debug your code when formview has no records.

  If you still can't solve the problem, please post your aspx and aspx.cs code.

  Best regards,

  Sam

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• • Reply
  Billson3000

  Member

  48 Points

  149 Posts

  Re: FormView Conditional Format Error

  Oct 22, 2019 05:12 AM|Billson3000|LINK

  Here is my full cs corrected following advice from oned_gk. I am currently trying this on FormView Pre-render. This now works. Thanks very much oned.

  protected void FormView1_PreRender(object sender, EventArgs e)
          {
              Label lbl1 = (Label)FormView1.FindControl("MyLabel");
               if (FormView1.PageCount > 0 && lbl1.Text == "Y")
              {
                  lbl1.BackColor = System.Drawing.Color.Green;
              }
  	}