Cannot get values from Gridview when binding it without SQLDatasource?

Question

I am binding some Data in the Page_load method in GridView1. I have a checkBox CheckBox1. After checking the checkboxes i want to display something(As a test) in the Label1 when i press a button . But it is not showing. I am not Binding Data with SQLDatasource rather i am binding it manually.

My Page_load method

 protected void Page_Load(object sender, EventArgs e)
 {
    string[,] arrMultiD = {
                { "John", "21", "Berlin", "Germany" },
                { "Smith", "33" ,"London", "UK"},
                { "Ryder", "15" ,"Sydney", "Australia"},
                { "Jake", "18", "Tokyo", "Japan"},
                { "Tom","34" , "Mumbai", "India"}
             };
    DataTable dt = new DataTable();
    dt.Columns.Add("Name", Type.GetType("System.String"));
    dt.Columns.Add("Age", Type.GetType("System.String"));
    dt.Columns.Add("City", Type.GetType("System.String"));
    dt.Columns.Add("Country", Type.GetType("System.String"));
    for (int i = 0; i < 5; i++)
    {
        dt.Rows.Add();
        dt.Rows[dt.Rows.Count - 1]["Name"] = arrMultiD[i, 0];
        dt.Rows[dt.Rows.Count - 1]["Age"] = arrMultiD[i, 1];
        dt.Rows[dt.Rows.Count - 1]["City"] = arrMultiD[i, 2];
        dt.Rows[dt.Rows.Count - 1]["Country"] = arrMultiD[i, 3];
    }
    GridView1.DataSource = dt;
    GridView1.DataBind();

}

My Button Click function

protected void Button1_Click(object sender, EventArgs e)
{
    foreach (GridViewRow row in GridView1.Rows)
    {
        // Access the CheckBox
        CheckBox cb = (CheckBox)row.FindControl("CheckBox1");
        if (cb != null && cb.Checked)
        {
            Label1.Text += "1";
        }
    }
}

I have checked in debug mode. When i was clicking the button, the if portion was not being executed. It is as if the Data in the GridView was lost as soon as i clicked the button. In other words GridView lost its data when it was out of Page_Load method

my aspx code

<form id="form1" runat="server">
    <asp:GridView ID="GridView1" runat="server" AutoGenerateDeleteButton="True">
        <Columns>
            <asp:TemplateField HeaderText="dd">
                <ItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

    <asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click" />
    <br />
    <asp:Label ID="Label1" runat="server"></asp:Label>
</form>

Did you check in debug mode if you enter into Button1_Click and the if inside it? — Plue
– Plue, Commented Feb 28, 2014 at 9:48
Yes I checked with Debug mode. It does not Enter into the if portion. Its as if the Gridview has no data inside it when i click the button. — user2489415
– user2489415, Commented Feb 28, 2014 at 9:50

Dilip Suvagiya · Accepted Answer · 2014-02-28 10:03:58Z

1

Try this one:

protected void Button1_Click(object sender, EventArgs e)
{
    foreach (GridViewRow row in GridView1.Rows)
    {
        // Access the CheckBox
        CheckBox cb = (CheckBox)row.FindControl("CheckBox1");
        if (cb.Checked)
        {
            Label1.Text += "1";
        }
    }
}

answered Feb 28, 2014 at 10:03

Dilip Suvagiya

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Comments

Mandar Patil · Accepted Answer · 2014-02-28 10:08:21Z

Try this, you have to check for IsPostBack on page load before binding the grid.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string[,] arrMultiD = {
            { "John", "21", "Berlin", "Germany" },
            { "Smith", "33" ,"London", "UK"},
            { "Ryder", "15" ,"Sydney", "Australia"},
            { "Jake", "18", "Tokyo", "Japan"},
            { "Tom","34" , "Mumbai", "India"}
         };
        DataTable dt = new DataTable();
        dt.Columns.Add("Name", Type.GetType("System.String"));
        dt.Columns.Add("Age", Type.GetType("System.String"));
        dt.Columns.Add("City", Type.GetType("System.String"));
        dt.Columns.Add("Country", Type.GetType("System.String"));
        for (int i = 0; i < 5; i++)
        {
            dt.Rows.Add();
            dt.Rows[dt.Rows.Count - 1]["Name"] = arrMultiD[i, 0];
            dt.Rows[dt.Rows.Count - 1]["Age"] = arrMultiD[i, 1];
            dt.Rows[dt.Rows.Count - 1]["City"] = arrMultiD[i, 2];
            dt.Rows[dt.Rows.Count - 1]["Country"] = arrMultiD[i, 3];
        }
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

Amit Tiwari · Accepted Answer · 2014-02-28 10:08:07Z

0

    if (!Page.IsPostBack)
    {
        string[,] arrMultiD = {
        { "John", "21", "Berlin", "Germany" },
        { "Smith", "33" ,"London", "UK"},
        { "Ryder", "15" ,"Sydney", "Australia"},
        { "Jake", "18", "Tokyo", "Japan"},
        { "Tom","34" , "Mumbai", "India"}
     };
        DataTable dt = new DataTable();
        dt.Columns.Add("Name", Type.GetType("System.String"));
        dt.Columns.Add("Age", Type.GetType("System.String"));
        dt.Columns.Add("City", Type.GetType("System.String"));
        dt.Columns.Add("Country", Type.GetType("System.String"));
        for (int i = 0; i < 5; i++)
        {
            dt.Rows.Add();
            dt.Rows[dt.Rows.Count - 1]["Name"] = arrMultiD[i, 0];
            dt.Rows[dt.Rows.Count - 1]["Age"] = arrMultiD[i, 1];
            dt.Rows[dt.Rows.Count - 1]["City"] = arrMultiD[i, 2];
            dt.Rows[dt.Rows.Count - 1]["Country"] = arrMultiD[i, 3];
        }
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

place your code in page.ispostbak block

edited Feb 28, 2014 at 10:08

answered Feb 28, 2014 at 9:51

Amit Tiwari

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1 Comment

Amit Tiwari Over a year ago

check now the solution you have not implemented the condition for postback hence on button click it reload the page and clear the checkbox...

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