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copied!<p>You can add asp.net required field validators to each text box in your gridview. </p> <pre><code><asp:TextBox id="txtQty" runat="server"></asp:TextBox> <asp:RequiredFieldValidator id="reqQty" ControlToValidate="txtQty" ErrorMessage="*"></asp:RequiredFieldValidator> </code></pre> <p><strong>Elaboration</strong></p> <p>T-SQL</p> <pre><code>create table products ( id int identity(1,1), name varchar(500), price decimal(18,2) ) insert into products values ('Soap', 15.0) insert into products values ('Provitas', 25.0) insert into products values ('Paper', 10.0) insert into products values ('Foam Bath', 150.0) </code></pre> <p>ASPX</p> <pre><code> <asp:GridView ID="gvTest" runat="server" DataSourceID="SqlTest" AutoGenerateColumns="false"> <Columns> <asp:BoundField HeaderText="ID" DataField="ID" /> <asp:BoundField HeaderText="Name" DataField="Name" /> <asp:BoundField HeaderText="Price" DataField="Price" /> <asp:TemplateField HeaderText="Qty"> <ItemTemplate> <asp:TextBox ID="txtQty" runat="server"></asp:TextBox> <asp:RequiredFieldValidator ID="reqQty" runat="server" ControlToValidate="txtQty" ErrorMessage="*"></asp:RequiredFieldValidator> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> <asp:SqlDataSource ID="SqlTest" runat="server" ConnectionString="Data Source=.\SQLEXPRESS;Initial Catalog=play;Persist Security Info=True;User ID=user;Password=userpassword" SelectCommand="SELECT id, name, price FROM Products"></asp:SqlDataSource> <asp:Button ID="cmdTest" runat="server" Text="Submit" /> </code></pre> <p>C# button click handler to get the qty entered by the user</p> <pre><code>protected void cmdTest_Click(object sender, EventArgs e) { for (int i = 0; i < gvTest.Rows.Count; i++) { int qty = Convert.ToInt32(((TextBox)gvTest.Rows[i].FindControl("txtQty")).Text); // code here } } </code></pre> <p>Validation Result</p> <p><img src="https://i.stack.imgur.com/7qrsV.jpg" alt="enter image description here"></p>

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