Question

Convert Null to Decimal

Asked by: jung1975

Below is my update command event..
I am trying to make the update caluculation works wether user input the data or not (NULL )

Here is my caculation part:
     row.Cells[6].Text = Convert.ToString(Convert.ToDecimal((Grossrevenue) * Convert.ToDecimal((TextBoxC.Text.Trim()))));


This calculation will work as long as user input the data in the textbox,but It won't work if user leave the value in blank because it's trying to pass the NULL value into the calculation( I am getting an error : "Input string was not in a correct format."...
Is there any work around wayto make this work, so whether user inputs the value into the textbox or not, it will still work?

------------------------------------------------
if (e.CommandName == "Update")
        {
            int index = Convert.ToInt32(e.CommandArgument);

            DataKey key = GridView1.DataKeys[index];

            GridViewRow row = GridView1.Rows[index];

            TextBox TextBoxC = (TextBox)row.FindControl("TextBox1");
            decimal Grossrevenue = decimal.Parse(row.Cells[3].Text.Trim().Replace("$", "").Replace(",", ""));
   
            row.Cells[6].Text = Convert.ToString(Convert.ToDecimal((Grossrevenue) * Convert.ToDecimal(Convert.ToString(TextBoxC.Text.Trim()))));
            TextBox mdh = (TextBox)row.Cells[4].Controls[0];
            //decimal Medical_UNH = Convert.ToDecimal(mdh.Text.Trim());
            String Medical_UNH = Convert.ToString(mdh.Text.Trim());
           // decimal Supp_contractual_Allowances = Convert.ToDecimal(row.Cells[5].Text);
            String Supp_contractual_Allowances = Convert.ToString(row.Cells[5].Text);
            Int32 Assertions_key = Convert.ToInt32(key.Value);

            SqlDataSource1.UpdateParameters["Medical_UNH"].DefaultValue = Convert.ToString(Medical_UNH);
            SqlDataSource1.UpdateParameters["Supp_contractual_Allowances"].DefaultValue = Convert.ToString(Supp_contractual_Allowances);
            SqlDataSource1.UpdateParameters["Assertions_key"].DefaultValue = Convert.ToString(Assertions_key);
           

        }

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Asked On
2006-02-23 at 13:29:10ID21749336
Tags

null

,

convert

,

decimal

Topic

Web Languages/Standards

Participating Experts
2
Points
125
Comments
2

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Answers

 

by: amit_gPosted on 2006-02-23 at 13:41:59ID: 16033625


string sGrossrevenue;
decimal Grossrevenue;

sGrossrevenue = row.Cells[3].Text.Trim().Replace("$", "").Replace(",", "");
sGrossrevenue = System.Text.RegularExpressions.Regex.Replace(sGrossrevenue, @"[^0-9]", @"");

if (sGrossrevenue != "")
{
    Grossrevenue = decimal.Parse(row.Cells[3].Text.Trim().Replace("$", "").Replace(",", ""));
}
else
{
    Grossrevenue = 0;
}

 

by: rodnexPosted on 2006-02-23 at 14:45:50ID: 16034160

I'd like to add that the problem you are encountering is a very common issue of user input validation, you are attempting to convert other values (Convert.ToDecimal(TextBoxC.Text)) for example to a Decimal at points in your code which will also fail if the user inputs none decimal data here.

In addition to copy/pasting amit's code, you shoudl read up on and try some input validation, there are many levels you can approach this at, the first being the ASP.NET validator controls. On the server side, you can write wrappers for the common Convert methods and implement try/catch or other checks to gracefully handle this type of input..hope it helps


20120131-EE-VQP-002

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