[GridView] After RemoveAt() method, the column data using Eval() is disappeared RSS

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  lionelsiu

  Member

  30 Points

  38 Posts

  [GridView] After RemoveAt() method, the column data using Eval() is disappeared

  Apr 12, 2012 12:56 PM|LINK

  When I press a button, it will execute the following method.

  MyGridView.Columns.RemoveAt(index);

  After this, when I try to remove another column in gridview again, the column data using Eval() will be disappeared. (That column is within the gridview and I won't remove it)

   <asp:TemplateField HeaderText="header">
  <ItemTemplate>
  <%# Eval("data") %>
  </ItemTemplate>
  </asp:TemplateField>

  Please tell me why this will happen? How can I fix this bug?? THX!
  
  
  

  • Edited by lionelsiu on Apr 12, 2012 12:57 PM
  • Edited by lionelsiu on Apr 12, 2012 04:34 PM
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  sam.kumar

  Member

  62 Points

  46 Posts

  Re: [GridView] After RemoveAt() method, the column data using Eval() is disappeared

  Apr 15, 2012 09:15 AM|LINK

  have u confirmed whether u r deleting the correct column ???

  if yes then please post you code where you are removing it >>

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  TimoYang

  Contributor

  3732 Points

  1275 Posts

  Re: [GridView] After RemoveAt() method, the column data using Eval() is disappeared

  Apr 15, 2012 09:20 AM|LINK

  lionelsiu——

  Because when you remove Columns，only the UI doesn't show the value of that field；but you still have that column in your bound datasource……So Eval still works well，but no appearing！！！

  • Edited by TimoYang on Apr 15, 2012 09:21 AM
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  lionelsiu

  Member

  30 Points

  38 Posts

  Re: [GridView] After RemoveAt() method, the column data using Eval() is disappeared

  Apr 15, 2012 10:12 AM|LINK

  I am sure I delete the correct column. Here are the code I used to remove the column:

  bool ColValueExists = false;
          bool ColItemsExists = false;
          bool DeletedColValue = false;
          int ColValueIndex =-1, ColItemsIndex =-1;
  
          foreach (DataControlField col in list.Columns)
          {
              if (col.HeaderText == "Total Value")
              {
                  ColValueIndex = list.Columns.IndexOf(col);
                  ColValueExists = true;
              }
  
              if (col.HeaderText == "Total Items")
              {
                  ColItemsIndex = list.Columns.IndexOf(col);
                  ColItemsExists = true;
              }
          }
  
  
          if (!ColValueExists && addlist.Items.FindByValue("TotalValue").Selected)
          {
              BoundField TotalValue = new BoundField();
              TotalValue.DataField = "TotalValue";
              TotalValue.HeaderText = "Total Value";
              TotalValue.NullDisplayText = "0";
              TotalValue.SortExpression = "TotalValue";
              list.Columns.Add(TotalValue);
          }
          else if (ColValueExists && !addlist.Items.FindByValue("TotalValue").Selected)
          {
              list.Columns.RemoveAt(ColValueIndex);
              DeletedColValue = true;
          }
  
          if (!ColItemsExists && addlist.Items.FindByValue("TotalItems").Selected)
          {
              BoundField TotalItems = new BoundField();
              TotalItems.DataField = "TotalItems";
              TotalItems.HeaderText = "Total Items";
              TotalItems.SortExpression = " TotalItems";
              list.Columns.Add(TotalItems);
          }
          else if (ColItemsExists && !addlist.Items.FindByValue("TotalItems").Selected)
          {
              if (DeletedColValue)
                  ColItemsIndex--;
  
              list.Columns.RemoveAt(ColItemsIndex);
          }
          list.DataBind();

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  lionelsiu

  Member

  30 Points

  38 Posts

  Re: [GridView] After RemoveAt() method, the column data using Eval() is disappeared

  Apr 15, 2012 10:12 AM|LINK

  TimoYang

  lionelsiu——

  Because when you remove Columns，only the UI doesn't show the value of that field；but you still have that column in your bound datasource……So Eval still works well，but no appearing！！！

  So could you plz tell me how can I solve this problem?? Thx!

• • Reply
  

  TimoYang

  Contributor

  3732 Points

  1275 Posts

  Re: [GridView] After RemoveAt() method, the column data using Eval() is disappeared

  Apr 16, 2012 01:20 AM|LINK

  lionelsiu

  So could you plz tell me how can I solve this problem?? Thx!

  This isn't a REAL problem but just something like you have a duplicated column in your DataTable.