In asp.net, how to update all records in datagrid at one time? You can use the following method, first,
Create a template column for the column to be updated in DATAGRID, for example:
asp:datagrid id="dgPopularFAQs" runat="server"
AutoGenerateColumns="False"
...>
<Columns>
<asp:BoundColumn DataField="FAQID" ItemStyle-Width="10%"
ItemStyle-HorizontalAlign="Center" HeaderText="FAQ ID" />
<asp:BoundColumn DataField="CategoryName" HeaderText="Category" />
<asp:TemplateColumn HeaderText="Question">
<ItemTemplate>
<asp:TextBox runat="server" id="txtDescription" Columns="75"
Text='<%# Container.DataItem("Description") %>' />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Submitted By">
<ItemTemplate>
<asp:TextBox runat="server" id="txtSubmittedBy"
Text='<%# Container.DataItem("SubmittedByName") %>' />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>
After that, perform a traversal of DATAGRID,
Dim myConnection as New SqlConnection(connection string)
Dim myCommand as New SqlCommand(strSQL, myConnection)
Dim dgi as DataGridItem
For Each dgi in dgPopularFAQs.Items
'Read in the Primary Key Field
Dim id as Integer = Convert.ToInt32(dgPopularFAQs.DataKeys(dgi.ItemIndex))
Dim question as String = CType(dgi.FindControl("txtDescription"), TextBox).Text
Dim submittedBy as String = CType(dgi.FindControl("txtSubmittedBy"), TextBox).Text
'Issue an UPDATE statement...
Dim updateSQL as String = "UPDATE TableName SET Question = @Question, " & _
"SubmittedByName = @SubmittedByName WHERE FAQID = @ID"
myCommand.Parameters.Clear()
myCommand.Parameters.Add("@Question", question)
myCommand.Parameters.Add("@SubmittedByName", submittedBy)
myCommand.ExecuteNonQuery()
Next