how to find gridview cell text

Question

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hi,
I have a gridview as

XML

<asp:GridView ID="GridView1" runat="server" Style="z-index: 114; left: 106px; position: absolute;
            top: 239px" Width="939px" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333">
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <Columns>

                <asp:TemplateField HeaderText="productname">
                    <ItemTemplate>
                        <asp:Label ID="Label4" runat="server" Text='<%# Bind("Product") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="price">
                    <ItemTemplate>
                        <asp:Label ID="Label3" runat="server" Text='<%# Bind("Price") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="quantity">
                    <ItemTemplate>
                        <asp:Label ID="Label2" runat="server" Text='<%# Bind("Quantity") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="total">
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("Total") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <EditRowStyle BackColor="#999999" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        </asp:GridView>

and i want to count all the row in the gridview also want to add all the total and then assign to the textbox.
for this i have written code as

C#

public void grandtotal()
    {
        int sum = 0;
        myDataTable = (DataTable)ViewState["PRODUCTTABLE"];
        for (int i = 0; i <=GridView1.Rows.Count;i++)
        {
            sum+=Convert.ToInt16(GridView1.Rows[i].Cells[3].Text);

        }
        TextBox7.Text = Convert.ToString(sum);

    }

but i am getting error as input string was not in a correct format .why so.
what is the wrong in the above code.also i tried as

MIDL

sum+=Convert.ToInt16(GridView1.Rows[i].Cells[2].Text);

and so on.but still the same error.

Posted 8-Mar-11 5:56am

software_Engi08

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Comments

Orcun Iyigun 8-Mar-11 12:03pm

Have you tried debugging it? What is the value that you are getting from the cells?

Make sure you are not getting a null value because you can't convert a null value to a meaningful value through Convert. Your best option is to check for null first.

Another option;

Your example will not work if the object does not convert to a number. In "sum" do you only get numbers or a currency. for ex; $15 or something like that..

software_Engi08 8-Mar-11 12:11pm

yes i have debug it.there is a null values in the cell. but y so .y i am getting null values .whats wrong

Orcun Iyigun 8-Mar-11 12:34pm

do you have only null values or some value and null values? If you have only null values that means that you cant successfully bind. Check if your columns matches with your (query or dataset whatsoever). If you have null + values, that means the data that you are retrieving from have null values.

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rajivpande86 · Answer 1 · 2011-03-08T07:00:00

This line

sum+ = Convert.ToInt16(GridView1.Rows[i].Cells[2].Text);

is not working, as the data is not in your gridview's cell.You are using the template fields and want to access the data from there.
Replace the above line with -

sum+ = Convert.ToInt16(((Label)GridView1.Rows[i].Cells[2].FindControl("Label1")).Text);

I would also suggest you to use the RowDataBound event handler of the gridview as an alternative.
There you will just need to tweak it as -

sum+ = Convert.ToInt16(((Label)e.Row.Cells[2].FindControl("Label1")).Text);

HTH
Rajeev

Please vote and mark the answer as accepted if this helps.

Steve Wellens · Answer 2 · 2011-03-08T06:14:00

Solution 1

Here's a different approach:
http://weblogs.asp.net/stevewellens/archive/2008/10/31/summing-columns-in-a-gridview.aspx[^]

Posted 8-Mar-11 6:14am

Steve Wellens

TweakBird · Answer 3 · 2011-03-08T06:29:00

Solution 2

Hi

Have a look on these links. You have to use the GridView1_RowDataBound event. Try some samples here

http://msdn.microsoft.com/en-us/library/ms972833.aspx[^]
http://authors.aspalliance.com/aspxtreme/sys/web/ui/webcontrols/demos/gridviewrowcreatedrowdatabound.aspx[^]

See here similar discussion
http://www.eggheadcafe.com/community/aspnet/17/10183305/showing-calculated-footer-in-dynamically-generated-gridview.aspx[^]

Posted 8-Mar-11 6:29am

TweakBird

Updated 8-Mar-11 6:33am

v2

Comments

Rubaba 8-Mar-11 13:04pm

best links!!

TweakBird 8-Mar-11 13:23pm

Thank you.

vazid ali 16-Jun-12 8:41am

int quant = 0;
HtmlInputText itQuant = (HtmlInputText)row.FindControl("itProductQuantity");
quant =int.Parse(itQuant.Value);

input string is not in correct formate please give me solution ...
i am beginer in asp.net
.thanks in advance