get id of items that i click on button in a datalist with itemtemplate

When you add a imagebutton to the itemtemplate go to its properties and change the CommandName property to your desired name, here lets say we call it "Add to Cart". Also the label for the id field will have the id="IdLabel"
Now in the coding

protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        int i;
        if (e.CommandName == "Add to Cart")
        {
            i = e.Item.ItemIndex;
            Label l = (Label)DataList1.Items[i].FindControl("IdLabel");
            Response.Write(l.Text);
//here add the logical implementation of adding item to cart now that you have got hold of your id
        }

    }

no

i have a DATALIST no gridview

and my datalist is in a page that users can see it

and i don't want have any checkbox on it

really i want have an image button that work like select in a datalist
it's means when users click on imagebutton , that product added to the shopping cart

There's another simpler way too...
Enable selecting in your gridview and then in code behind use the following code

 protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        int i = GridView1.SelectedIndex;
        Response.Write(GridView1.Rows[i].Cells[1].Text);
        Response.Write(GridView1.Rows[i].Cells[2].Text);
        //Response.Write(i);
    }


Hope this helps too....

Instead of using a button it's a lot more convinient to use a checkbox, so that it can be easily mapped. All you've got to do is in the template field add a checkbox with id="cbx". Now keep a button outside of the gridview on the page. Use the following code to get the id of  items selected through checkbox.

for (int i = 0; i < GridView1.Rows.Count; i++)

{

GridViewRow row = GridView1.Rows[i];

bool isChecked = ((CheckBox)row.FindControl("cbxSelect")).Checked;

if (isChecked)

{

str.Append(GridView1.Rows[i].Cells[0].Text);

}

}

Label1.Text = str.ToString();

Hope this helps

Happy Coding....