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Editorial Team
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Asked: 2026-06-13T06:10:17+00:00

I have a gridview with textbox inside I want to get value of this

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I have a gridview with textbox inside

I want to get value of this textbox on button click

But I always receiving “0” (default) value

I think this problem related to viewstate but I’m not sure

Tell me please what I’m doing wrong?

Source code:

protected void Page_Load(object sender, EventArgs e)
{
    DataSet dataSet = new DataSet("MyDataSet");
    DataTable table = new DataTable();
    table.Columns.Add(new DataColumn("NameValue"));
    table.Columns.Add(new DataColumn("Number"));
    table.Columns.Add(new DataColumn("NumberValue"));
    dataSet.Tables.Add(table);

    DataRow row = dataSet.Tables[0].NewRow();
    row[0] = "Name";
    row[1] = "0";

    dataSet.Tables[0].Rows.Add(row);

    this.MyGridView.DataSource = dataSet;
    this.MyGridView.DataBind();
}

protected void Button1_Click(object sender, EventArgs e)
{
    TextBox txtsn = ((TextBox)this.MyGridView.Rows[0].FindControl("NumberTextBox"));
    string sn = txtsn.Text;
}




<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
        <asp:GridView ID="MyGridView" AutoGenerateColumns="false" ShowHeader="false" runat="server" >
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Label ID="NameLabel" runat="server" Text='<%#Eval("NameValue")%>' />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:TextBox ID="NumberTextBox" runat="server" Text='<%#Eval("NumberValue")%>' />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </div>
    </form>
</body>
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1 Answer

  1. Editorial Team

    The problem is that you always bind the grid to it’s DataSource even on postbacks. That overrides all changes made by the user.

    Instead use the IsPostBack property:

    protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostback)
    {
        DataSet dataSet = new DataSet("MyDataSet");
        DataTable table = new DataTable();
        table.Columns.Add(new DataColumn("NameValue"));
        table.Columns.Add(new DataColumn("Number"));
        table.Columns.Add(new DataColumn("NumberValue"));
        dataSet.Tables.Add(table);

        DataRow row = dataSet.Tables[0].NewRow();
        row[0] = "Name";
        row[1] = "0";

        dataSet.Tables[0].Rows.Add(row);

        this.MyGridView.DataSource = dataSet;
        this.MyGridView.DataBind();
    }
}

    You need to reload the DataSource only if something was changed(f.e. a record was deleted or added, the user clicked a sort-column or you have paging). But then you should do that only in the appropriate event handlers and not in page_load. So it’s best to wrap this code in a method which you can call from anywhere.

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