Question

I had posted a thread a while back about avoiding adding blank rows into the database. Before when something was to click add row it would automatically add a blank row into the database regardless if the user canceled the new row. I figured it out but now came to a new issue. If the user decides to reload the page(F5) while editing the new row, it will add a blank row into the database, thats a no no for my situation. Can anyone help me figure out how to avoid that?

Below is my insert code:

protected void gv_RowCommand(object sender, GridViewCommandEventArgs e)
    {

        if (e.CommandName == "Insert") //- this is needed to explain that the INSERT command will only work when INSERT is clicked
        {
            gv.DataBind();

            DataTable d = dbcon.GetDataTable("SELECT * FROM CIS.CIS_TRANS ORDER BY ID DESC", "ProjectCISConnectionString");

            string transCode = "", fundCode = "", BSA_CD = "", DP_TYPE = "";

            if (d.Rows.Count > 0)
            {
                transCode = d.Rows[0]["TRANS_CD"].ToString();
                fundCode = d.Rows[0]["FUND_CD"].ToString();
                BSA_CD = d.Rows[0]["BSA_CD"].ToString();
                DP_TYPE = d.Rows[0]["DP_TYPE"].ToString();

                if (transCode.Trim().Length > 0)
                {
                    dbcon.Execute("INSERT INTO CIS.CIS_TRANS (ID,TRANS_CD) VALUES(CIS.S_CIS_TRANS.nextval,'')", "ProjectCISConnectionString");

                    gv.DataBind();
                }
            }

            gv.EditIndex = gv.Rows.Count - 1;

        }
        else if (e.CommandName == "Cancel")
        {
            DataTable d = dbcon.GetDataTable("SELECT * FROM CIS.CIS_TRANS ORDER BY ID DESC", "ProjectCISConnectionString");

            string transCode = "";

            if (d.Rows.Count > 0)
            {
                transCode = d.Rows[0]["TRANS_CD"].ToString();

                if (transCode.Trim().Length == 0)
                {
                    dbcon.Execute(string.Format("DELETE CIS.CIS_TRANS WHERE ID = '{0}'", d.Rows[0]["ID"]), "ProjectCISConnectionString");

                    gv.DataBind();
                }
            }


        }
    }

Answer 1

If you want to avoid inserting blank row by the user, you need validators. Add RequiredFieldValidator to the insert template:

<asp:RequiredFieldValidator runat="server" ID="valFieldName"
< ControlToValidate="txtFieldName" ErrorMessage="FieldName is missing" />

In your method check if Page.IsValid == true before you insert to the database.

EDIT:
If you want to avoid postbacks completely, you can insert the whole grid into an UpdatePanel:

<asp:UpdatePanel>
    <ContentTemplate>
        <asp:GrdiView>
        ....
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

Now when the user hits F5 he just reload the page again and not posting back an insert command.