Question

data table contain column named as Fld_primary. this column contain value like 0.00 it is double datatype in mysql table.i want store that datatable value in double variable. am always getting error when i convert to double datatype.

my code
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Dim ds5 As dataset1.DTSUMDataTable = TA5.GetData(users)

Dim dttot As Double
dttot = CType(ds5("fld_primary").ToString, Double)

Error

 Conversion from string "fld_primary" to type 'Integer' is not valid.

Answer 1

Your error is actually: ds5 expects an integer as a parameter, so using ds5("fld_primary") is not valid in your code. Perhaps you can try ds5(0)("fld_primary").

After you fixed it, use

dttot = Double.Parse(whatever_string_you_should_put_here)

If you cannot ensure your string must be a valid double, then use Double.TryParse.