Change color of a label inside a gridview RSS

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  macal_vm

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  Change color of a label inside a gridview

  Mar 30, 2007 12:42 PM|LINK

  Hi.

  Im trying to change the color of labels inside my gridview according to the text it contains.

  So I tried this code:

  protected void Page_Load(object sender, EventArgs e)
      {
         Label statslab = (Label)GridView1.FindControl("Label1");
              string statstxt = statslab.Text;
                  if (statstxt == "Hold")
                  {
                      statslab.Attributes.Add("style", "color:red");
                  }
      }

  But I keep getting this error: "Object reference not set to an instance of an object."

  What can I do to make it work?

  Im using VWD and C#.

  Thx!

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  stiletto

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  Re: Change color of a label inside a gridview

  Mar 30, 2007 01:24 PM|LINK

  You have to do this kind of conditional formatting in the RowDataBound event (or your Grid's equivalent). 

  There, your code should have the right context to be able to find the Label and allow you to set the formatting.

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  rumbafum

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  Re: Change color of a label inside a gridview

  Mar 30, 2007 01:29 PM|LINK

  you should do this not in page_load event but in your gridview rowcreated event.
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  macal_vm

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  Re: Change color of a label inside a gridview

  Mar 30, 2007 01:33 PM|LINK

  doent matter where I put the code, I keep getting the same error msg on this line:

  string statstxt = statslab.Text; -> "Object reference not set to an instance of an object."

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  stiletto

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  Re: Change color of a label inside a gridview

  Mar 30, 2007 05:00 PM|LINK

  In the GridView, you wouldn't get the Label using FindControl.  You get the desried grid column by index.

  Here's a tutorial link: http://msdn2.microsoft.com/en-us/library/bb288030.aspx

  • Marked as answer by Rex Lin - MSFT on Apr 02, 2007 07:22 AM
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  rumbafum

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  Re: Change color of a label inside a gridview

  Mar 30, 2007 05:22 PM|LINK

  To Change the label ForeColor i use this:

  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
      {
          if (e.Row.RowType == DataControlRowType.DataRow)
          {
              Label label = (Label)e.Row.FindControl("label");

              if(label.Text.Equals("TEST"))

                  label.ForeColor = Color.Red;

  the label is inside a templatefield, itemtemplate right? with runat=server?

  • Marked as answer by Rex Lin - MSFT on Apr 02, 2007 07:19 AM
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  stiletto

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  Re: Change color of a label inside a gridview

  Mar 30, 2007 05:45 PM|LINK

  I'm not sure if that will get you close enough. 

  You might need to use e.Row.Cells[<Zero-based index of cell containing desired Label control>].FindControl.

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  macal_vm

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  Re: Change color of a label inside a gridview

  Apr 02, 2007 12:20 PM|LINK

  thx rum! 

  it worked!

  =D

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  rumbafum

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  Re: Change color of a label inside a gridview

  Apr 03, 2007 06:18 PM|LINK

  Glad I could help :)
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  b471code3

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  Re: Change color of a label inside a gridview

  Jun 13, 2008 08:53 PM|LINK

  I found this to be somewhat helpful!  Thanks Rumbafum!

   have close to the same situation although I need to look at a date in the row and compare it to the current date.  So if the date in the specific row of the gridview is earlier than today the text or date should be red.  If it is greater than Today the text should be black.

  Any thoughts on that?

  Remember to mark as answer if this post answered or solved your problem.