Question

First of all, I am a new C# developer and I need some help please, I have a grid view with its SqlDataSource in my aspx file that contains 3 columns ID/Name/Job and several records(rows). When the user selects a row, I would like to redirect to another page and pass as a parameter the value of the selected ID of the row. Users are permitted to select only one row each time. I spent several hours on that however something strange is happened.

I have a method

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
       string selectedID;

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            GridViewRow gvr = e.Row;
            selectedID = (GridView1.DataKeys[e.Row.RowIndex].Value.ToString());
            gvr.Attributes.Add("OnClick","javascript:location.href='Views/EditMenus/EditCompany.aspx?id=" + selectedID + "'");

            gvr.Attributes.Add("onmouseover", "this.style.backgroundColor='#FFE6E6'");
            gvr.Attributes.Add("onmouseout", "this.style.backgroundColor=''");
            gvr.Attributes.Add("style", "cursor:pointer;");

            Session["IDs"] = selectedID;
     } }

In my redirect page I have in page load method the following code:

 protected void Page_Load(object sender, EventArgs e)
    {
          if (Session["IDs"] != null)
        {            
            Label2.Text = "Selected ID is: "+ Session["IDs"].ToString();
         }
    }

Now, when I select a row, the redirection to the other page works correctly and the browser url has the correct value of the selected ID according the javascript code above, however the Label2.Text prints a wrong ID. Instead of the value of the selected ID, it prints the value ID of the last row of each page. Why that happens?

It’s a bit strange for me since I am using the same variable “selectedID” for both cases as you can see above.

Answer 1

You need to sore value of your ID in Session variable on SelectedIndexChanged event of your GridView

void CustomersGridView_SelectedIndexChanging(Object sender, GridViewSelectEventArgs e)
  {

    // Get the currently selected row.
    //Because the SelectedIndexChanging event occurs  before the select operation
    //in the GridView control, the SelectedRow property cannot be used.
    //Instead, use the Rows collection
    //and the NewSelectedIndex property of the 
    //e argument passed to this event handler.

    GridViewRow row = CustomersGridView.Rows[e.NewSelectedIndex];

    //Cells[0] is for first column so assign according to your column for ID
    Session["IDs"]=row.Cells[0].Text;


  }