Why the dropdown list insert "SELECT" list item into SQL?

Question

1.00/5 (1 vote)

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SQL-Server-2008R2

i have written the following code in asp.net c# web form:

ASP.NET

<asp:DropDownList ID="ddltype" runat="server" CssClass="dropspace" Style="width: 95%; float: left">
                                            <asp:ListItem >SELECT YOUR GADGET</asp:ListItem>
                                            <asp:ListItem >Laptop</asp:ListItem>
                                            <asp:ListItem >Desktop</asp:ListItem>
                                            <asp:ListItem >Printer</asp:ListItem>
                                        </asp:DropDownList>

the problem is that when i click on submit button without selecting any item from dropdown list it insert "SELECT YOUR GADGET" into the sql database. please help me out from this problem. please write the c# code so that it can not insert first list item value to the data base.

What I have tried:

C#

if(ddltype.selectedValue !="")
{ cmd = new SqlCommand("sp_submitquery", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add("@gadget", SqlDbType.VarChar).Value = ddltype.SelectedValue;
            

            cmd.ExecuteNonQuery();
          

              ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "anything", "alert('Your Query Submitted Sucessfully');", true);
}



 if (ddltype.SelectedValue == "")
        {
            ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "anything", "alert('Please select your gadget');", true);
        }

Posted 30-Apr-16 14:33pm

Umair Nafis

Updated 5-May-16 23:49pm

Santosh Kokatnur

v2

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Comments

Sergey Alexandrovich Kryukov 30-Apr-16 20:56pm

One way to normalize the situation is to enforce selection of an item in all list boxes. If a user did not select anything, it should be your "select your gadget" element. Isn't that simple?
In server side, handle this selection and don't insert if this is that first element.
—SA

3 solutions

Solution 2

in your

ASP.NET

<asp:ListItem >SELECT YOUR GADGET</asp:ListItem>

put
Value="0"
u can also validate with a requiredfiled validator using InitialValue="0"

Posted 30-Apr-16 18:13pm

SagSD

Solution 3

If you set index as a 0. So you will get the default index value before saving the data and then you check this index value as a 0 or not and fire the popup whatever you want.

Posted 5-May-16 23:49pm

Hrishikesh Ranjit Shivacharan

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JayantaChatterjee · Accepted Answer · 2016-04-30T15:47:00

I think this would be your solution..

C#

if(ddltype.selectedindex==0)
{
ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "anything", "alert('Please select your gadget');", true);
return;
}
if(ddltype.selectedValue !="")
{ cmd = new SqlCommand("sp_submitquery", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@gadget", SqlDbType.VarChar).Value = ddltype.SelectedValue;


cmd.ExecuteNonQuery();


ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "anything", "alert('Your Query Submitted Sucessfully');", true);
}