convert type string to int

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hi how can i convert nvarchar to int in asp.net?
i set date to textbox but type of date in my sql is nvarchar
my code is;

C#

PersianCalendar p = new PersianCalendar();
      DateTime mdate = DateTime.Now;
      int pyear = p.GetYear(mdate);
      int pmonth = p.GetMonth(mdate);
      int pday = p.GetDayOfMonth(mdate);
      string pdate = string.Format("{2}/{1}/{0}", pyear, pmonth, pday);
      TextBox2.Text = pdate;
//..................
  SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=NezamPezeshki;Integrated Security=True");
        con.Open();
    
        SqlCommand com = new SqlCommand("INSERT INTO shekayat(FileNum,shekayatDate, shakiName, shakiTell, patient, Description) VALUES ( @shd, @shn, @sht, @p, @des,@fn)", con);
        com.Parameters.AddWithValue("@shn", TextBox1.Text);
        com.Parameters.AddWithValue("@shd", TextBox2.Text);
        com.Parameters.AddWithValue("@p", TextBox3.Text);
        com.Parameters.AddWithValue("@sht", TextBox4.Text);
        com.Parameters.AddWithValue("@fn",TextBox13.Text);
        com.Parameters.AddWithValue("@des", TextBox7.Text);
        
 
        Label3.Visible = true;
        int id = Convert.ToInt32(com.ExecuteScalar());
         Label3 .Text  = String.Format("شماره کلاسه {0}", id);

       
        Label3.Text = "success";
        con.Close();

Posted 3-Jul-12 19:16pm

veusk

Updated 3-Jul-12 19:17pm

Vani Kulkarni

v2

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2 solutions

Solution 2

First thing, why so: type of date in my sql is nvarchar

Second, you can try:
Convert.ToInt32 to convert a string into interger. You can handle the conversion failure as Overflow or Format exception.

Ex:

C#

int convertedInteger = Convert.ToInt32("someString");
// if someString was 1234, convertedInteger = 1234
// if someString was null, convertedInteger = 0

Refer: MSDN: Convert.ToInt32 Method (String)[^]

UPDATE:
my field in sql is nvarchar and i want send date like 12/02/2012 to related field in sql

Your code already have most of it. To have a defined date format sent as a string to a Varchar field:

C#

int pyear = p.GetYear(mdate);
int pmonth = p.GetMonth(mdate);
int pday = p.GetDayOfMonth(mdate);
string pdate = string.Format("{2}/{1}/{0}", pyear, pmonth, pday);
// Now pass this pdate to database for that varchar field.

Posted 3-Jul-12 19:31pm

Sandeep Mewara

Updated 3-Jul-12 19:48pm

v4

Comments

veusk 4-Jul-12 2:08am

i did it,but receive bellow error,yet;

Conversion failed when converting the nvarchar value '13/4/1391' to data type int.

Sandeep Mewara 4-Jul-12 3:18am

Error says issue when you try to convert it into integer which will be.

what you ask is how to put it in varchar which is not an integer and will not throw any error.

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OriginalGriff · Accepted Answer · 2012-07-03T19:23:00

Solution 1

Either use int.Parse[^] or int.TryParse[^]:

C#

string s = "1234";
int i = int.Parse(s);
...
int j;
if (int.TryParse(s, out j))
   {
   ...
   }

[edit]Improved example - OriginalGriff[/edit]

Posted 3-Jul-12 19:23pm

OriginalGriff

Updated 3-Jul-12 19:24pm

v2

Comments

Rahul Rajat Singh 4-Jul-12 1:27am

+5.