Execute an "INSERT INTO" in the HeaderRow using RowCommand - asp.net

Question

I am trying to execute an "INSERT INTO" in the HeaderRow.
The button in the HeaderRow does not trigger the RowCommand.
The gridview contains 5 columns: idt, datetime, col1, col2 and col3.
Protected Sub gvtest_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs) Handles gvtest.RowCommand
Dim txt1, txt2, txt3 as String
If e.CommandName = "insertinto" Then
Try
txt1 = DirectCast(gvtest.HeaderRow.FindControl("tbins1"), TextBox).Text
txt2 = DirectCast(gvtest.HeaderRow.FindControl("tbins2"), TextBox).Text
txt3 = DirectCast(gvtest.HeaderRow.FindControl("tbins3"), TextBox).Text
sqltest.InsertParameters("#datetime").DefaultValue = DateTime.Now()
sqltest.InsertParameters("#col1").DefaultValue = txt1
sqltest.InsertParameters("#col2").DefaultValue = txt2
sqltest.InsertParameters("#col3").DefaultValue = txt3
sqltest.Insert()
Catch ex As Exception
TextBox1.Text = "Insert: " & ex.Message
End Try
gvtest.DataBind()
End If
End Sub
default.aspx
<asp:GridView ID="gvtest"
runat="server"
DataSourceID="sqltest"
AutoGenerateColumns="False"
DataKeyNames="idt"
OnRowCommand="gvtest_RowCommand">
<Columns>
<asp:BoundField DataField="idt" HeaderText="idt" Readonly="true" SortExpression="idt" />
<asp:BoundField DataField="datetime" HeaderText="datetime" SortExpression="datetime" />
<asp:TemplateField SortExpression="col1">
<HeaderTemplate>
<asp:TextBox ID="tbins1" text="col1" runat="server" MaxLength="40" />
</HeaderTemplate>
</asp:TemplateField>
<asp:TemplateField SortExpression="col2">
<HeaderTemplate>
<asp:TextBox ID="tbins2" text="col2" runat="server" MaxLength="40" />
</HeaderTemplate>
</asp:TemplateField>
<asp:TemplateField SortExpression="col3">
<HeaderTemplate>
<asp:TextBox ID="tbins3" text="col3" runat="server" MaxLength="40" />
</HeaderTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
<asp:Button ID="btnins" CommandName="insertinto" runat="server" Text="Insert Into" OnClick="btnins_Click" />
</HeaderTemplate>
</asp:GridView>
<asp:SqlDataSource
id="sqltest"
ConnectionString="<%$ ConnectionStrings:connone %>"
SelectCommand="SELECT * FROM [test];
InsertCommand="INSERT INTO [test] datetime,col1,col2,col3 VALUES #datetime,#col1,#col2,#col3;">
</asp:SqlDataSource>
Note for brevity textboxes were omitted containing the gridview data.

Answer 1

You need to use a known command name, like Insert. It will not know your custom command name.
Read this:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.buttonfield.commandname(v=vs.110).aspx
change:
<asp:Button ID="btnins" CommandName="insertinto" runat="server" Text="Insert Into" OnClick="btnins_Click" />
to:
<asp:Button ID="btnins" CommandName="Insert" runat="server" Text="Insert Into" OnClick="btnins_Click" />

Answer 2

GridView row command events come from the Command controls on the data rows.
You placed a button in the GridView header, you need to process the btnins.Command event