Using GridView in Asp.Net

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hi I'm trying to insert ,update,edit and delete records in my grid,records are inserted successfully,but on update and delete it is giving an exception..

C#

protected void gvDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
       {
       int UserId = Convert.ToInt32(gvDetails.DataKeys[e.RowIndex].Values["UserId"].ToString());
       string username = gvDetails.DataKeys[e.RowIndex].Values["UserName"].ToString();
       con.Open();
       SqlCommand cmd = new SqlCommand("delete from Trn_Contact1 where UserId=" + UserId, con);
       int result = cmd.ExecuteNonQuery();
       con.Close();
       if (result == 1)
       {
       BindEmployeeDetails();

       lblresult.Text = username + " details deleted successfully";
       }
       }

the exception thrown is in .. int UserId = Convert.ToInt32(gvDetails.DataKeys[e.RowIndex].Values["UserId"].ToString()); and the exception is ... Input string was not in a correct format.
can someone please help.

Posted 11-Aug-12 0:12am

pree_kh

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Volynsky Alex 11-Aug-12 8:45am

Interesting question

2 solutions

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Sarrrva · Accepted Answer · 2012-08-11T00:47:00

See your source file and check parameter name and that data type:

XML

<asp:SqlDataSource ID="sqlds" runat="server" ConnectionString="<%$ ConnectionStrings:dbconnection %>"
SelectCommand="Select * from Employee_Details"
InsertCommand="insert into Employee_Details(UserName,FirstName,LastName,City,Designation) values(@UserName,@FirstName,@LastName,@City,@Designation)"
DeleteCommand="delete from Employee_Details where UserId=@UserId"
UpdateCommand="update Employee_Details set FirstName=@FirstName,LastName=@LastName, City=@City,Designation=@Designation where UserId=@UserId">
<UpdateParameters>
<asp:Parameter Name="UserId" Type= "Int32" />
<asp:Parameter Name="FirstName" Type="String" />
<asp:Parameter Name="LastName" Type="String" />
<asp:Parameter Name="City" Type="String" />
<asp:Parameter Name="Designation" Type="String" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="UserName" Type="String" />
<asp:Parameter Name="FirstName" Type="String" />
<asp:Parameter Name="LastName" Type="String" />
<asp:Parameter Name="City" Type="String" />
<asp:Parameter Name="Designation" Type="String" />
</InsertParameters>
</asp:SqlDataSource>
</div>

regards

sarva

_Raj sinha · Accepted Answer · 2012-08-11T19:18:00

Try this

ASP.NET

 <asp:gridview id="gvDetails" runat="server" cssclass="Gridviews" autogeneratecolumns="false" datakeynames="empid" onrowcommand="gvDetails_RowCommand" xmlns:asp="#unknown">
<columns>
 <asp:templatefield>
 <itemtemplate>
 <asp:imagebutton id="imgdelete" runat="server" commandname="cmdDelete" commandargument='<%# Eval("empid") %>' imageurl="~/Images/delete.png">
 ToolTip="Delete" Height="20px" Width="20px" />
</asp:imagebutton></itemtemplate>
</asp:templatefield>
</columns>
</asp:gridview>
 <asp:label id="lblresult" runat="server" xmlns:asp="#unknown" />

Write the following code on:

C#

 protected void gvDetails_RowCommand(object sender, GridViewCommandEventArgs e)
    {
if (e.CommandName == "cmdDelete")
        {
            int empid1 = Convert.ToInt32(e.CommandArgument.ToString());
            con.Open();
            SqlCommand cmd = new SqlCommand("delete from empdetails where empid=@empid", con);
            cmd.Parameters.Add(new SqlParameter("@empid", (object)empid1));
            int res = cmd.ExecuteNonQuery();
            con.Close();
            if (res == 1)
            {
                 BindEmployeeDetails();

                lblresult.Text = "Records deleted sucessfully";
            }
        }
}

Using GridView in Asp.Net

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