gridview findcontrol returning nothing empty string(Blank)

Question

I am trying to pass a session value from a gridview select row using GridView1_RowEditing1 event. i am able to get session value for primarykey (p.key) but the Associate_ID returns empty.

C# Code behind

protected void GridView1_RowEditing1(object sender, GridViewEditEventArgs e)
    {
       int primarykey =  Convert.ToInt32(GridView1.DataKeys[e.NewEditIndex].Value);
       string name = Convert.ToString(GridView1.Rows[e.NewEditIndex].FindControl("Associate_ID"));
       Session["Number"] = primarykey;
       Session["Name"] = name;
       //redirect
       Response.Redirect("updatee.aspx");
     }

.ASPX

<asp:TemplateField HeaderText="Associate_ID" SortExpression="Associate_ID">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Associate_ID") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("Associate_ID") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>

OUTPUT:

Key: 5

Name:

As you can see i am not getting Associate_ID for selected field. Also tried using

string name = Convert.ToString(GridView1.Rows[3].Cells[3].FindControl("Associate_ID"));

but there was no result, the grid has multiple columns and rows (8*15)

tried suggestions on gridview findcontrol returning empty "" and tried stopping re-binding the GridView on the PostBack. removed DataSourceID from gridview

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID" OnRowEditing="GridView1_RowEditing1" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">

code behind

     protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //DataSourceID = "SqlDataSource1"
            GridView1.DataSource = SqlDataSource1;
            GridView1.DataBind();
        }
    }

None of this helped. I am still getting a blank value for Associate_ID. i am unable to see where the issue is. Please help!

VDWWD · Accepted Answer · 2017-09-07T18:48:36.757

0

You are trying to find the Control Associate_ID with FindControl. But it does not exist. Either find TextBox1 or rename the TextBox to Associate_ID.

<EditItemTemplate>
    <asp:TextBox ID="Associate_ID" runat="server" Text='<%# Bind("Associate_ID") %>'></asp:TextBox>
</EditItemTemplate>

//or

string name = Convert.ToString(GridView1.Rows[3].Cells[3].FindControl("TextBox1"));

UPDATE

I see the problem, somehow you are trying to access those control before the edit state has been activated by rebinding the GridView. The edit index has not been set. So place this before the FindControl.

GridView1.DataSource = yourSource;
GridView1.EditIndex = e.NewEditIndex;
GridView1.DataBind();

edited Sep 07 '17 at 18:48

answered Sep 07 '17 at 17:35

VDWWD

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i tried changing textbox ID as you mentioned but it's not giving a blank "" – rakesh Sep 07 '17 at 17:46
confirmed that it is indeed returning NULL by using below. `TextBox name= (TextBox)GridView1.Rows[3].Cells[3].FindControl("TextBox1");` `string Ques = name.Text;)` - This threw a NullReferenceException error – rakesh Sep 07 '17 at 17:57
First Comment EDIT: i tried changing textbox ID as you mentioned but it's still giving a blank "" – rakesh Sep 07 '17 at 18:16
Updated my anwer. You are never setting the edit index. – VDWWD Sep 07 '17 at 18:48

score 0 · Answer 2 · answered Sep 08 '17 at 06:33

Thank you so much VDWWD, i was finally able to get it to work. The problem was i was not able to use get my 'TextBox' element in gridview using FindControl. The solution was to not re-binding the GridView on the PostBack of the page and edit index on the RowEditing event.

This is what my working code looks like, is any one ever comes across a similar issue

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            GridView1.DataSource = SqlDataSource1;
            GridView1.DataBind();
        }
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.DataSource = SqlDataSource1;
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataBind();
        TextBox txt = GridView1.Rows[e.NewEditIndex].FindControl("TextBox1") as TextBox;
        string name = txt.Text;
     }

.ASPX

        <EditItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("CountryName") %>'></asp:TextBox>
                </EditItemTemplate>

gridview findcontrol returning nothing empty string(Blank)

2 Answers2