Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error RSS

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  stephen.adsh...

  Member

  20 Points

  76 Posts

  Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error

  Mar 27, 2009 10:24 AM|LINK

  I have a button in my Gridview which i would like to execute on postback depending on the value in the 11 cell along (% COMPLETE colum in my gridview).

  I am getting "Object reference not set to an instance of an object."

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If IsPostBack = True Then
       If GridView1.SelectedRow.Cells(11).Text = "100.00%" Then
          MsgBox("100% Completion confirmed, record Saved")
       Else
           MsgBox("100% Completion required to Save")
       End If
    End If
  End Sub

  Any ideas where i am going wrong?

  gridview button selected row cells ispostback

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  mohd786hussa...

  Contributor

  4329 Points

  878 Posts

  Re: Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error

  Mar 27, 2009 12:24 PM|LINK

   Have you binded your grid before checking the condition?
  

  Always "Mark as Answer" the Post That Solves the problem.Because It helps others to find the solution.
  Mohammad Hussain
  Web design, Logo design & Asp.net development
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  Sangeeth.Ind...

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  1042 Points

  297 Posts

  Re: Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error

  Mar 27, 2009 12:31 PM|LINK

  Hi,

  Make sure that the GridView has a row 'Selected'. You can try changing the condition to,

  If IsPostBack = True AndAlso GridView1.SelectedRow IsNot Nothing Then

   EndIf

  Or, why don't u try to access the row with its index (rather than SelectedRow)?

  Cheers 

   

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  stephen.adsh...

  Member

  20 Points

  76 Posts

  Re: Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error

  Mar 27, 2009 02:16 PM|LINK

  I cant use index (or at least i think i cant) becuase i want to check if the 10th cell equals "100%". I have added selected row to the Datagrid and it now picks up the selectedrow value which is great!

   Problem i now have is that if i click on a record that has 100% in the 10th cell it stores this so when i click on one that doesnt equal 100% it gives me the same message but if i click it again it then realises its not 100% and gives me the correct result.

   I cannot see what is wrong with my If statement or why it would do that:

   

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
          If IsPostBack = True AndAlso GridView1.SelectedRow IsNot Nothing Then
              If GridView1.SelectedRow.Cells(10).Text = "100.00%" Then
                  MsgBox("Completion confirmed")
              Else
                  MsgBox("Error: Order is incomplete. 100% Completion is required to Save")
              End If
          End If
      End Sub

   

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  Gary yang - ...

  All-Star

  25901 Points

  2588 Posts

  Re: Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error

  Mar 30, 2009 09:05 AM|LINK

  stephen.adshead

  I have a button in my Gridview which i would like to execute on postback depending on the value in the 11 cell along (% COMPLETE colum in my gridview).

  I suggest you execute the block code in Button_click event.

  Gary yang - MSFT
  Microsoft Online Community Support
  
  Please remember to mark the replies as answers if they help and unmark them if they provide no help.
  
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  Gary yang - ...

  All-Star

  25901 Points

  2588 Posts

  Re: Gridview Button (GridView1.SelectedRow.Cells().Text ) Object error

  Mar 31, 2009 03:19 AM|LINK

  stephen.adshead

  I have a button in my Gridview which i would like to execute on postback depending on the value in the 11 cell along (% COMPLETE colum in my gridview).

  I am getting "Object reference not set to an instance of an object."

  After reading your post again. It seems that you want to get the selected row and do something according to its value. If in this case, when you click the button, the Button_Click event will be fired only when the Page_load has been finished. Please refer to the following code:

  //Html

  <form id="form1" runat="server">
  
  
       <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" >
          <Columns>
          <asp:TemplateField>
          <ItemTemplate>
              <asp:CheckBox ID="CheckBox1" runat="server" />
              <asp:Label ID="ID" runat="server" Text='<%#Eval("ID") %>' style="display:none"></asp:Label>
          </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField>
          <ItemTemplate>
              <asp:Label ID="lb_strSSNum" runat="server" Text='<%#Eval("NewLetters") %>' style="display:none"></asp:Label>
          </ItemTemplate>
          </asp:TemplateField>
              <asp:BoundField DataField="Column1" HeaderText="Header1" SortExpression="Column1"/>
              <asp:BoundField DataField="Column2" HeaderText="Header2"/>
          </Columns>
      </asp:GridView>
      <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
        </form>

   //

      private void Page_Load(object sender, System.EventArgs e)
      {
          if (!IsPostBack)
          {
              DataBinds();
          }
      }
      protected void Button1_Click(object sender, EventArgs e)
      {
          foreach (GridViewRow dr in GridView1.Rows)
          {
              CheckBox chk = dr.Cells[0].FindControl("CheckBox1") as CheckBox;
              if (chk.Checked)
              {
                  string str = dr.Cells[3].Text;
                  Response.Write(str);
              }
          }
      }
      void DataBinds()
      {
          DataRow dr = null;
          DataTable dt = new DataTable();
  
          dt.Columns.Add(new DataColumn("ID", typeof(String)));
          dt.Columns.Add(new DataColumn("Column1", typeof(String)));
          dt.Columns.Add(new DataColumn("Column2", typeof(String)));
          dt.Columns.Add(new DataColumn("NewLetters", typeof(Boolean)));
  
          for (int r = 1; r < 10; r++)
          {
              dr = dt.NewRow();
              dr[0] = r.ToString();
              dr[1] = "images/b.gif"; //+ r.ToString();
              dr[2] = "Column2" + r.ToString();
              dr[3] = true;
              dt.Rows.Add(dr);
          }
          GridView1.DataSource = dt;
          GridView1.DataBind();
      }

   

  Gary yang - MSFT
  Microsoft Online Community Support
  
  Please remember to mark the replies as answers if they help and unmark them if they provide no help.
  
  • Marked as answer by Gary yang - MSFT on Apr 02, 2009 02:15 AM