How to Fetch Identity specification details of Column in Sql Server table?

string conString = //your connection sting
string query = "select * from tableName";
SqlConnection con = new SqlConnection(conString);

try
{
   con.Open();
   SqlCommand cmd = new SqlCommand(query, con);
   SqlDataReader reader = cmd.ExecuteReader();
   //Below schema obj contain the schema of the table
   DataTable schema = reader.GetSchemaTable();
   //Schema obj has all the details that you want
   reader.Close();
}
catch(Exception e)
{
   Console.WriteLine("Error Occurred: " + e);
}
finally
{
   conn.Close();
}