Gridview ERROR WEB based

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Sir,
I am getting this ERROR while updating or deleting data in gridview.
“Must declare scalar variable @id”.
Delete command for example: delete command=”DELETE FROM [table]” WHERE [id]=@id”
I saw the above delete command in source of the page.
Please tell me where to declare @id? Please solve the problem in details. I have a table with 3 columns id (int), name (varchar) & email (varchar).
This is a web based gridview where I true Autogenerate property of edit and delete.
Regards.
Hasan

What I have tried:

C#

Sir,
I am getting this ERROR while updating or deleting data in gridview.
"Must declare scalar variable @id".
Delete command for example: delete command="DELETE FROM [table]" WHERE [id]=@id" 
I saw the above delete command in source of the page.
Please tell me where to declare @id? Please solve the problem in details. I have a table with 3 columns id (int), name (varchar) & email (varchar).
This is a web based gridview where I true Autogenerate property of edit and delete.
Regards.
Hasan

Posted 15-Dec-16 16:07pm

Member 12634216

Updated 15-Dec-16 18:20pm

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Er Parul · Answer 1 · 2016-12-15T18:20:00

Hi,

Have you create update and Delete parameters. Have you pass dataKeyNames ? As you have ID in your table so DataKeyNames must be ID. Please refer following code.
In code, you can see parameters for update and delete like

ASP.NET

<UpdateParameters>
                <asp:Parameter Name="Mobile" />
                <asp:Parameter Name="Email" />
            </UpdateParameters>
            
            <DeleteParameters>
                <asp:Parameter Name="EmpID" /> 
            </DeleteParameters>

Full Code as below

HTML

<html>
<head>
    <title>GridView Edit and Delete Row</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView
            ID="GridView1" Font-Names="Arial" Font-Size="Smaller" 
            AutoGenerateColumns="False" 
            AutoGenerateEditButton="True" 
            AutoGenerateDeleteButton="False" 
            DataSourceID="SqlDataSource1" 
            DataKeyNames="EmpID"
            runat="server">
            
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <%--ADD THE DELETE LINK BUTTON--%>
                        <asp:LinkButton Runat="server" 
                            OnClientClick ="return confirm('Are you sure you?');"
                            CommandName="Delete">Delete</asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            
                <%--DATA BOUND COLUMNS--%>
                <asp:BoundField DataField="EmpID" HeaderText="EmpID" 
                    SortExpression="EmpID" ReadOnly="true" />
                <asp:BoundField DataField="EmpName" HeaderText="EmpName" 
                    SortExpression="EmpName" ReadOnly="true" />
                <asp:BoundField DataField="Mobile" HeaderText="Mobile" 
                    SortExpression="Mobile" />
                <asp:BoundField DataField="Email" HeaderText="Email" 
                    SortExpression="Email" />
            </Columns>
        </asp:GridView>
        
        <%--THE SQL DATA SOURCE CONNECTED WITH THE GRIDVIEW--%>
        <asp:SqlDataSource
            ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:DNA_CLASSIFIEDConnectionString %>"
            SelectCommand="SELECT [EmpID], [EmpName], [Mobile], [Email] FROM [EmployeeDetails]"
            UpdateCommand="UPDATE EmployeeDetails SET Mobile = @Mobile, Email = @Email 
                WHERE EmpID = @EmpID"
            DeleteCommand="DELETE FROM EmployeeDetails WHERE EmpID = @EmpID">
           
            <UpdateParameters>
                <asp:Parameter Name="Mobile" />
                <asp:Parameter Name="Email" />
            </UpdateParameters>
            
            <DeleteParameters>
                <asp:Parameter Name="EmpID" /> 
            </DeleteParameters>
            
        </asp:SqlDataSource>
    </div>
    </form>
</body>
</html>

Please refer link(GridView Edit, Update and Delete Example - Simple GridView Example with Row Edit and Delete Options - C# and Vb.Net[^]) for detail knowledge.