C#

string text = "0";
int inums =Convert.ToInt32(text);

text = "00.0000";
double dnums =Convert.ToDouble(text);

double d;
if(double.TryParse(text,System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d))
{
    //converion is ok
}
else
{
    //conversion is not ok
}

string text = "1,5345";
double d;
if(double.TryParse(text,System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d))
{
    int inums = Convert.ToInt32(d);
}

Christian Graus wrote:

protected internal presumably means visible only to derived classes within the current assembly.

oyams90 wrote:

if you'll send me a sample program with explanation

string Connection = ConfigurationManager.ConnectionStrings["Connect"].ConnectionString;
SqlConnection conn = new SqlConnection (Connection);
conn.Open();
SqlCommand cmd = new SqlCommand("sp_SelectAllData", conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
return dt;