An exception of type 'System.ArgumentException' occurred in System.Dat

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
public partial class AddStudentRecord : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Submit_Click(object sender, EventArgs e)
{
// string name = Name.Text;
}
protected void submit_Click(object sender, EventArgs e)
{
string con = " DataSource=BIJENDER-PC\\SQLSERVER;Initial Catalog = Batch_17028";
SqlConnection db = new SqlConnection(con);
db.Open();
//tring insert = "insert into tbl_user (u_fname,u_lname,u_contact,u_email) values ('"+txtFname.Text+"','"+txtLname.Text+"','"+txtContact.Text+"','"+txtEmail.Text+"')";
string insert = "insert into Student_Bio_Data (STD_Name) values ('" + name.Text +"')";
SqlCommand cmd = new SqlCommand(insert,db);
int m = cmd.ExecuteNonQuery();
if(m != 0)
{
//Response.Write("
//<script>alert('Data Inserted !!')</script>
//");
}
else
{
//Response.Write("
//<script>alert('Data Inserted !!')</script>
//");
}
db.Close();
}
}