Input string was not in a correct format.

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Hi,

Input string was not in a correct format. I am using drop down list how to convert coding!
I want to get integer value.

Schtype = Convert.ToInt32(cmbSchtype.SelectedItem.Value);
GenerateSingleSchedule(Schtype,Billno,option);
-----------

C#

private void FillSchtype()
        {
            try
            {
                cmbSchtype.DataSource = BillMast.GetSchedulelist(Session["DeptId"].ToString());
                cmbSchtype.DataTextField = "Descr";
                cmbSchtype.DataValueField = "ded_field";
                cmbSchtype.DataBind();
                if(Session["language"].ToString()!="English")
                     cmbSchtype.Items.Insert(0,new ListItem("--தேர்நதெடு--"));
                else
                     cmbSchtype.Items.Insert(0,new ListItem("--Select ScheduleType--"));
            }
            catch(Exception ex) {Response.Write(ex.Message);}
        }

Posted 12-Mar-13 2:15am

manuel_joseph

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ZurdoDev 12-Mar-13 8:16am

What IS the value?

4 solutions

Solution 1

Have a look at the TryParse method.
http://msdn.microsoft.com/en-us/library/system.int32.tryparse.aspx[^]

Good luck!

Posted 12-Mar-13 2:20am

E.F. Nijboer

Comments

CHill60 12-Mar-13 8:25am

Sorry for the overlap - I took too long to type mine!!

Solution 2

Firstly make sure that cmbSchType actually does have a selected value by checking for cmbSchtype.SelectedIndex >=0

Secondly, if the user selects your first entry then it's going to be text that cannot be converted to an integer so instead of using convert use TryParse ...

C#

if(cmbSchtype.SelectedIdex >=0)   // make sure there is something selected
{
     if (int.TryParsecmbSchtype.SelectedItem.Value, out Schtype)) // make sure it's an int
     {
          GenerateSingleSchedule(Schtype,Billno,option); // NOW you can use it
      }
}
}

Posted 12-Mar-13 2:24am

CHill60

Solution 4

May be it will help you

ListItem itm = new ListItem("--Select--", "0");
cmbSchtype.Items.Insert(0, itm);

Posted 12-Mar-13 2:30am

Shobhana.n

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*Karthik Harve* · Accepted Answer · 2013-03-12T02:29:00

HI,

the error is here

Quote:
Schtype = Convert.ToInt32(cmbSchtype.SelectedItem.Value);

you are referring "cmbSchtype.SelectedItem.Value", but value is empty or null, because of below statement.

Quote:
if(Session["language"].ToString()!="English")
cmbSchtype.Items.Insert(0,new ListItem("--தேர்நதெடு--"));
else
cmbSchtype.Items.Insert(0,new ListItem("--Select ScheduleType--"));

while creating ListItem object, you are specifying only Text, not the value. So, specify some integer value like below.

C#

if(Session["language"].ToString()!="English")
    cmbSchtype.Items.Insert(0,new ListItem("--தேர்நதெடு--", "0"));
else
    cmbSchtype.Items.Insert(0,new ListItem("--Select ScheduleType--", "1"));

hope it helps.