Editable gridview is not working - asp.net

Question

I have an editable gridview which the user can edit each row just by pressing linkbutton. I am getting an error and it stops my work. please help me.
HTML
<asp:GridView ID="gvList" runat="server" class="gv" CellPadding="2"
Font-Names="Calibri" ForeColor="#333333"
Font-Size="16px" Width="500px" AutoGenerateColumns="true" OnRowCancelingEdit="gvList_RowCancelingEdit"
OnRowEditing="gvList_RowEditing" OnRowUpdating="gvList_RowUpdating">
<Columns>
<asp:TemplateField HeaderText="User Name" HeaderStyle-ForeColor="White" HeaderStyle-Font-Bold="true" ItemStyle-Width="170px">
<ItemTemplate>
<asp:Label runat="server" ID="lblUsername" Text='<%# Eval("cUserName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="Editusername" runat="server" Text='<%# Eval("cUserName") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Dept User" HeaderStyle-ForeColor="White" HeaderStyle-Font-Bold="true" ItemStyle-Width="170px">
<ItemTemplate>
<asp:Label runat="server" ID="lblDept" Text='<%# iif(Eval("lDeptUser"),"Yes","No") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:RadioButtonList ID="RadioButtonList1" runat="server" >
<asp:ListItem>Yes</asp:ListItem>
<asp:ListItem>No</asp:ListItem>
</asp:RadioButtonList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Actions" HeaderStyle-ForeColor="White" HeaderStyle-Font-Bold="true" ItemStyle-Width="160px">
<ItemTemplate>
<asp:LinkButton ID="btnedit" CommandName="Edit" runat="server" Text="Edit" />
<asp:LinkButton ID="btnDelete" CommandName="Delete" runat="server" Text="Delete" />
</ItemTemplate>
<EditItemTemplate>
<asp:LinkButton ID="btnUpdate" CommandName="Update" runat="server" Text="Update" />
<asp:LinkButton ID="btnCancel" CommandName="Cancel" runat="server" Text="Cancel" />
</EditItemTemplate>
<HeaderStyle Font-Bold="True" ForeColor="White"></HeaderStyle>
<ItemStyle Width="120px"></ItemStyle>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
No records available
</EmptyDataTemplate>
<HeaderStyle BackColor="#808380" Font-Bold="True" ForeColor="White" VerticalAlign="Top" />
<EditRowStyle BackColor="#2461BF" />
<AlternatingRowStyle BackColor="#E3E3E3" />
</asp:GridView>
VB
Protected Sub gvList_RowUpdating(sender As Object, e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles gvList.RowUpdating
Dim oldname = DirectCast(gvList.Rows(e.RowIndex).FindControl("lblUsername"), Label)
Dim username As String = DirectCast(gvList.Rows(e.RowIndex).FindControl("Editusername"), TextBox).Text
Dim tempUser = DirectCast(gvList.Rows(e.RowIndex).FindControl("RadioButtonList1"), RadioButtonList).SelectedIndex
Dim query As String = "Update Intranet.dbo.Gn_ISCoordinators SET cUserName=#uname" +
",lDeptUser=#dept WHERE cUserName=#oldName"
Using con = New SqlConnection(ConfigurationManager.ConnectionStrings("IntranetConnectionString").ConnectionString)
con.Open()
Dim cmd = New SqlCommand(query, con)
cmd.Parameters.AddWithValue("#uname", username)
cmd.Parameters.AddWithValue("#dept", Convert.ToByte(tempUser))
cmd.Parameters.AddWithValue("#oldname", oldname)
cmd.ExecuteNonQuery()
End Using
gvList.EditIndex = -1
GetList()
End Sub
The problem is on the cmd.ExecuteNonQuery() it gives me The parameterized query '(#uname nvarchar(7),#dept tinyint,#oldname nvarchar(4000))Update' expects the parameter '#oldname', which was not supplied.
Any thing wrong in my query?

Answer 1

Try this
Dim oldname as Label =gvList.Rows(e.RowIndex).FindControl("lblUsername")
Dim username as TextBox = gvList.Rows(e.RowIndex).FindControl("Editusername")
Dim tempUser as RadioButtonList = DirectCast(gvList.Rows(e.RowIndex).FindControl("RadioButtonList1"), RadioButtonList).SelectedIndex
Dim query As String = "Update Intranet.dbo.Gn_ISCoordinators SET cUserName=#uname" +
",lDeptUser=#dept WHERE cUserName=#oldname"
Using con = New SqlConnection(ConfigurationManager.ConnectionStrings("IntranetConnectionString").ConnectionString)
con.Open()
Dim cmd = New SqlCommand(query, con)
cmd.Parameters.AddWithValue("#uname", username.Text)
cmd.Parameters.AddWithValue("#dept", Convert.ToByte(tempUser.SelectedIndex))
cmd.Parameters.AddWithValue("#oldname", oldname.Text)
cmd.ExecuteNonQuery()
End Using
you have change the parameter name by making "N" capital in #oldName,so due to that
you are getting that Error

Answer 2

there is a typo in your parameter
Dim query As String = "Update Intranet.dbo.Gn_ISCoordinators SET cUserName=#uname" +
",lDeptUser=#dept WHERE cUserName=#oldName"
And you have
cmd.Parameters.AddWithValue("#oldname", oldname)
isn't it should be
cmd.Parameters.AddWithValue("#oldName", oldname)
there is capital and small letter mistake.

Answer 3

Sorry I dont have enough rep to comment so I have to answer here...
Why are you casting label to label and trying to use it as string?:
Dim oldname as string = DirectCast(gvList.Rows(e.RowIndex).FindControl("lblUsername"), Label).text
seems more appropriate.

Answer 4

Im not sure about this but maybe because when you tried to hit the edit button and the gridview's mode is in edit mode the lblUsername label will be changed to Editusername textbox.. So what I suggest is you try to put a global variable string that will store the data of the lblUsername before updating or editing..

Answer 5

Try this
Code look fine, but this line command.commandtype = commandtype.text is missing may be that the problem.
Also while passing parameter Addwithvalue use username.text instead on username same for other controls too
Dim oldname As Label = DirectCast(gvList.Rows(e.RowIndex).FindControl("lblUsername"), Label)
Dim username As TextBox = DirectCast(gvList.Rows(e.RowIndex).FindControl("Editusername"), TextBox).Text
Dim tempUser As RadioButton = DirectCast(gvList.Rows(e.RowIndex).FindControl("RadioButtonList1"), RadioButtonList).SelectedIndex
Dim query As String = "Update Intranet.dbo.Gn_ISCoordinators SET cUserName=#uname, lDeptUser=#dept WHERE cUserName=#oldName"
Using con = New SqlConnection(ConfigurationManager.ConnectionStrings("IntranetConnectionString").ConnectionString)
con.Open()
Dim cmd = New SqlCommand(query, con)
cmd.commandtype = commandtype.text
cmd.Parameters.AddWithValue("#uname", username.text)
cmd.Parameters.AddWithValue("#dept", Convert.ToByte(tempUser.selectedvalue))
cmd.Parameters.AddWithValue("#oldname", oldname.text)
cmd.ExecuteNonQuery()
End Using
gvList.EditIndex = -1
GetList()