convert hiddenfield datatype from string to int in c#

Hi,

Please try this one,

1. protected void Inkview_Click(object sender, EventArgs e)  
2.    {  
3.   
4.        int id = 0;  
5.        bool intValue =int.TryParse(hfId.Value, out id);  
6.        if(intValue){
7.          
8.        Session["DatakeyValue"] = id;  
9.         }
10.          else{
11.          Session["DatakeyValue"] = 0;
12.          }
13.        ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('" + Convert.ToInt32(Session["DatakeyValue"].Tostring()) + "')", true);  
14.        SqlConnection con = new SqlConnection("data source=NERE\\SQLEXPRESS01; Initial Catalog=kaging;Integrated Security=True;");  
15.        SqlCommand cm = new SqlCommand();  
16.        cm.Connection = con;  
17.        con.Open();  
18.        cm.CommandType = CommandType.Text;  
19.        cm.CommandText = "SELECT pid FROM job WHERE id=@id'";  
20.        cm.Parameters.AddWithValue("@id", Session["DatakeyValue"]);  
21.        Label1.Text = Convert.ToString(cm.ExecuteScalar());  
22.        con.Close();  
23.   
24.          }  

I tried this

int id = 0; int.TryParse(hfId.Value, out id);
Session["DatakeyValue"] = id;
ClientScript.RegisterClientScriptBlock(this.GetType(), "", "alert('" + id + "')", true);

The response was 0,,data was not selected into it Label.Text ,because the id of the  Grid view row cell is not present in id.

Hey you can try like this Int32.Parse(hiddenfield.value) Convert.ToInt32(hiddenfield.value) But if hiddenfield value contains int value like 10 Or 20 Or any int value then it will work. Let's say if hiddenfield value contains any string like xyz or abc or any string value then you can't convert that string to int and at that time it will throw Input string was not in a correct format error. So in simple, you can't convert any string value to int but if value contains any int value then you can convert. See this video for more info, https://youtu.be/32Y_mHwD01U

https://youtu.be/PKlH1HCeGVE