convert string to float c#

[cathiec]

a column in my db is called cost. the type of this column is float. i am using visual studio . NET. A user enters the cost into a textfield on the form. i use the code:

 

float fCost = Convert.ToInt64(TextBox9.Text);

 

this works fine when numbers are entered into TextBox9.Text but when i try to enter a cost with a decimal point eg 9.99 i get an error.

 

when i use

 

double fcost = Convert.ToDouble(TextBox9.Text);

 

the error says cannot convert from double to float.

 

any suggestion?

[Cags]

have you tried this...

 

float fCost = (float)TextBox9.Text;

[PlausiblyDamp]

float fCost = float.Parse(TextBox9.Text);

[Jaco]

The entire area of conversions hasn't been well thought out in .NET (this is one of the only areas of VB that is much more straightforward). There are so many options in .NET, but some are almost never useful (such as the Convert class "To..." methods - you don't want to have exceptions thrown all over the place or to even expect to catch them).

 

I use this (gasp.. VB-ish) method CFloat since it doesn't assume you'd like to get exceptions when the value is not quite what you expect:

 

internal static float CFloat(object oValue)

{

if (oValue == null || System.Convert.IsDBNull(oValue))

return 0;

 

string sString = oValue.ToString().Trim();

 

double dValue=0;

if (double.TryParse(sString, NumberStyles.Any,

CultureInfo.CurrentCulture, out dValue))

if (dValue <= float.MaxValue && dValue >= float.MinValue)

return (float)(System.Math.Round(dValue));

else

return 0;

else

return 0;

}

[Jaco]

Ooops - the System.Math.Round shouldn't be there