I have following tables in my database:
**SuggestionsLog Table:** ID, Title, Description.
**Employee Table:** Username, Name
**Divisions Table:** DivisionCode, DivisionName
I want to show table that consists of SuggestionID, SuggestionTitle, EmployeeName and DivisionName only and when the user clicks on the SuggestionTitle, a pop-up window will be displayed with the description of the suggestion.
Since I am ASP.NET beginner developer, I tried to follow one of the tutorials to get it but I failed.
What I did is the following:
**ASP.NET Code:**
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ID"
DataSourceID="SqlDataSource1" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="ID" />
<asp:TemplateField HeaderText="Title">
<ItemTemplate>
<asp:LinkButton runat="server" ID="lnkSuggestionTitle"
Text='<%#Eval("Title") %>'
OnClick="lnkSuggestionTitle_Click">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<%--<asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />--%>
<asp:BoundField DataField="Description" HeaderText="Description"
SortExpression="Description" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Username" HeaderText="Username"
SortExpression="Username" />
<asp:BoundField DataField="DivisionName" HeaderText="Division"
SortExpression="DivisionName" />
</Columns>
</asp:GridView>
<asp:Button runat="server" ID="btnModalPopUp" style="display:none" />
<AjaxToolkit:ModalPopupExtender ID="modalPopUpExtender1"
runat="server" TargetControlID="btnModalPopUp" PopupControlID="pnlPopUp" BackgroundCssClass="modalBackground"
OkControlID="btnOk" X="20" Y="100">
</AjaxToolkit:ModalPopupExtender>
<asp:Panel runat="server" ID="pnlPopUp" CssClass="confirm-dialog">
<asp:GridView ID="GridView2" runat="server">
</asp:GridView>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
<br />
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommand="SELECT dbo.SafetySuggestionsLog.ID, dbo.SafetySuggestionsLog.Title, dbo.SafetySuggestionsLog.Description, dbo.employee.Name, dbo.SafetySuggestionsLog.Username,
dbo.Divisions.DivisionName
FROM dbo.employee INNER JOIN
dbo.SafetySuggestionsLog ON dbo.employee.Username = dbo.SafetySuggestionsLog.Username INNER JOIN
dbo.Divisions ON dbo.employee.DivisionCode = dbo.Divisions.SapCode">
</asp:SqlDataSource>
**Code-Behind:**
protected void lnkSuggestionTitle_Click(object sender, EventArgs e)
{
LinkButton lnkSuggestionTitle = sender as LinkButton;
string strSuggestionTitle = lnkSuggestionTitle.Text;
string strConnectionString = ConfigurationManager.ConnectionStrings["testConnectionString"].ConnectionString;
string strSelect = "SELECT ID, Title, Description FROM dbo.SafetySuggestionsLog";
SqlConnection sqlCon = new SqlConnection();
sqlCon.ConnectionString = strConnectionString;
SqlCommand cmdSuggestionDetails = new SqlCommand();
cmdSuggestionDetails.Connection = sqlCon;
cmdSuggestionDetails.CommandType = System.Data.CommandType.Text;
cmdSuggestionDetails.CommandText = strSelect;
cmdSuggestionDetails.Parameters.AddWithValue("@Title", strSuggestionTitle);
sqlCon.Open();
SqlDataReader dReader = cmdSuggestionDetails.ExecuteReader();
GridView1.DataSource = dReader;
GridView1.DataBind();
sqlCon.Close();
modalPopUpExtender1.Show();
}
Everything is going well and smooth, but in the website, when I clicked on one of the titles, I did not get the ModalPopUp. Also, I got an error notification at the left bottom corner in the Internet Explorer browser, which when I opened it, it gave me the following description:
**
Sys.ArgumentNullException: Value cannot be null. Parameter name: elements
**
I don't know why this is happened. Any help please?
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